ES310089A1 - Method of and apparatus for the production of expanded aminoplasts and modification of the cellular structure thereof - Google Patents
Method of and apparatus for the production of expanded aminoplasts and modification of the cellular structure thereofInfo
- Publication number
- ES310089A1 ES310089A1 ES0310089A ES310089A ES310089A1 ES 310089 A1 ES310089 A1 ES 310089A1 ES 0310089 A ES0310089 A ES 0310089A ES 310089 A ES310089 A ES 310089A ES 310089 A1 ES310089 A1 ES 310089A1
- Authority
- ES
- Spain
- Prior art keywords
- foamed
- aminoplast resin
- produced
- resin
- soluble
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 229920003180 amino resin Polymers 0.000 title abstract 18
- 210000003850 cellular structure Anatomy 0.000 title abstract 4
- 238000000034 method Methods 0.000 title 1
- 238000012986 modification Methods 0.000 title 1
- 230000004048 modification Effects 0.000 title 1
- 229920005989 resin Polymers 0.000 abstract 14
- 239000011347 resin Substances 0.000 abstract 14
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 abstract 6
- 239000000654 additive Substances 0.000 abstract 5
- 239000004088 foaming agent Substances 0.000 abstract 5
- 239000000243 solution Substances 0.000 abstract 5
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 abstract 4
- 230000000996 additive effect Effects 0.000 abstract 4
- 239000003795 chemical substances by application Substances 0.000 abstract 4
- 238000001125 extrusion Methods 0.000 abstract 4
- 239000000203 mixture Substances 0.000 abstract 4
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 abstract 3
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 abstract 3
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 abstract 3
- 238000006243 chemical reaction Methods 0.000 abstract 3
- 239000000645 desinfectant Substances 0.000 abstract 3
- 239000003337 fertilizer Substances 0.000 abstract 3
- 235000013312 flour Nutrition 0.000 abstract 3
- 238000001746 injection moulding Methods 0.000 abstract 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 abstract 2
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 abstract 2
- 239000006185 dispersion Substances 0.000 abstract 2
- 229920006248 expandable polystyrene Polymers 0.000 abstract 2
- HYBBIBNJHNGZAN-UHFFFAOYSA-N furfural Chemical group O=CC1=CC=CO1 HYBBIBNJHNGZAN-UHFFFAOYSA-N 0.000 abstract 2
- 229920000728 polyester Polymers 0.000 abstract 2
- 239000004645 polyester resin Substances 0.000 abstract 2
- 239000000843 powder Substances 0.000 abstract 2
- GHMLBKRAJCXXBS-UHFFFAOYSA-N resorcinol Chemical compound OC1=CC=CC(O)=C1 GHMLBKRAJCXXBS-UHFFFAOYSA-N 0.000 abstract 2
- 239000004071 soot Substances 0.000 abstract 2
- 239000000126 substance Substances 0.000 abstract 2
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 abstract 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 2
- CZAUMIGWDFREBR-UHFFFAOYSA-N (6-methyl-2-oxo-1,3-diazinan-4-yl)urea Chemical compound CC1CC(NC(N)=O)NC(=O)N1 CZAUMIGWDFREBR-UHFFFAOYSA-N 0.000 abstract 1
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 abstract 1
- 239000004925 Acrylic resin Substances 0.000 abstract 1
- 229920000178 Acrylic resin Polymers 0.000 abstract 1
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 abstract 1
- YVGGHNCTFXOJCH-UHFFFAOYSA-N DDT Chemical compound C1=CC(Cl)=CC=C1C(C(Cl)(Cl)Cl)C1=CC=C(Cl)C=C1 YVGGHNCTFXOJCH-UHFFFAOYSA-N 0.000 abstract 1
- 229920000084 Gum arabic Polymers 0.000 abstract 1
- 229910019142 PO4 Inorganic materials 0.000 abstract 1
- 229930040373 Paraformaldehyde Natural products 0.000 abstract 1
- 241000978776 Senegalia senegal Species 0.000 abstract 1
- 239000004115 Sodium Silicate Substances 0.000 abstract 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 abstract 1
- 229920001807 Urea-formaldehyde Polymers 0.000 abstract 1
- 239000000205 acacia gum Substances 0.000 abstract 1
- 235000010489 acacia gum Nutrition 0.000 abstract 1
- IKHGUXGNUITLKF-XPULMUKRSA-N acetaldehyde Chemical compound [14CH]([14CH3])=O IKHGUXGNUITLKF-XPULMUKRSA-N 0.000 abstract 1
- 239000002253 acid Substances 0.000 abstract 1
- 239000001164 aluminium sulphate Substances 0.000 abstract 1
- 235000011128 aluminium sulphate Nutrition 0.000 abstract 1
- 239000007864 aqueous solution Substances 0.000 abstract 1
- 239000010425 asbestos Substances 0.000 abstract 1
- 239000010426 asphalt Substances 0.000 abstract 1
- 239000003899 bactericide agent Substances 0.000 abstract 1
- 238000010009 beating Methods 0.000 abstract 1
- 229910000019 calcium carbonate Inorganic materials 0.000 abstract 1
- 239000001110 calcium chloride Substances 0.000 abstract 1
- 229910001628 calcium chloride Inorganic materials 0.000 abstract 1
- 239000004202 carbamide Substances 0.000 abstract 1
- 239000005018 casein Substances 0.000 abstract 1
- BECPQYXYKAMYBN-UHFFFAOYSA-N casein, tech. Chemical compound NCCCCC(C(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(CC(C)C)N=C(O)C(CCC(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(C(C)O)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(COP(O)(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(N)CC1=CC=CC=C1 BECPQYXYKAMYBN-UHFFFAOYSA-N 0.000 abstract 1
- 235000021240 caseins Nutrition 0.000 abstract 1
- 239000003054 catalyst Substances 0.000 abstract 1
- 239000001913 cellulose Substances 0.000 abstract 1
- 229920002678 cellulose Polymers 0.000 abstract 1
- 239000003638 chemical reducing agent Substances 0.000 abstract 1
- 150000001805 chlorine compounds Chemical class 0.000 abstract 1
- 238000009833 condensation Methods 0.000 abstract 1
- 230000005494 condensation Effects 0.000 abstract 1
- BUACSMWVFUNQET-UHFFFAOYSA-H dialuminum;trisulfate;hydrate Chemical compound O.[Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O BUACSMWVFUNQET-UHFFFAOYSA-H 0.000 abstract 1
- 125000003438 dodecyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 abstract 1
- 239000006260 foam Substances 0.000 abstract 1
- 239000003292 glue Substances 0.000 abstract 1
- 239000010440 gypsum Substances 0.000 abstract 1
- 229910052602 gypsum Inorganic materials 0.000 abstract 1
- 239000010985 leather Substances 0.000 abstract 1
- 238000000465 moulding Methods 0.000 abstract 1
- 150000002823 nitrates Chemical class 0.000 abstract 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 abstract 1
- 235000006408 oxalic acid Nutrition 0.000 abstract 1
- 230000003647 oxidation Effects 0.000 abstract 1
- 238000007254 oxidation reaction Methods 0.000 abstract 1
- 229920002866 paraformaldehyde Polymers 0.000 abstract 1
- 239000008188 pellet Substances 0.000 abstract 1
- 229920001568 phenolic resin Polymers 0.000 abstract 1
- 239000005011 phenolic resin Substances 0.000 abstract 1
- 235000021317 phosphate Nutrition 0.000 abstract 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 abstract 1
- 239000002574 poison Substances 0.000 abstract 1
- 231100000614 poison Toxicity 0.000 abstract 1
- 229920001225 polyester resin Polymers 0.000 abstract 1
- ODGAOXROABLFNM-UHFFFAOYSA-N polynoxylin Chemical compound O=C.NC(N)=O ODGAOXROABLFNM-UHFFFAOYSA-N 0.000 abstract 1
- 229910052895 riebeckite Inorganic materials 0.000 abstract 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 abstract 1
- 229910052911 sodium silicate Inorganic materials 0.000 abstract 1
- HUAUNKAZQWMVFY-UHFFFAOYSA-M sodium;oxocalcium;hydroxide Chemical compound [OH-].[Na+].[Ca]=O HUAUNKAZQWMVFY-UHFFFAOYSA-M 0.000 abstract 1
- 238000003756 stirring Methods 0.000 abstract 1
- 150000005846 sugar alcohols Polymers 0.000 abstract 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 abstract 1
- 229910021653 sulphate ion Inorganic materials 0.000 abstract 1
- 235000013619 trace mineral Nutrition 0.000 abstract 1
- 239000011573 trace mineral Substances 0.000 abstract 1
- 150000003672 ureas Chemical class 0.000 abstract 1
- 239000002699 waste material Substances 0.000 abstract 1
- 239000002023 wood Substances 0.000 abstract 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
- B29B7/7404—Mixing devices specially adapted for foamable substances
- B29B7/7409—Mixing devices specially adapted for foamable substances with supply of gas
- B29B7/7419—Mixing devices specially adapted for foamable substances with supply of gas with static or injector mixer elements
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2361/00—Characterised by the use of condensation polymers of aldehydes or ketones; Derivatives of such polymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2361/00—Characterised by the use of condensation polymers of aldehydes or ketones; Derivatives of such polymers
- C08J2361/20—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
Foamed aminoplasts are produced and have their cellular structure modified by mixing a foamed-up foaming agent, a water-soluble aminoplast resin and a hardening agent and, during or after the admixing of the reaction components leading to the hardening of the foamed aminoplast resing produced and shortly bedore injection moulding or extrusion, adding continuously a dry mixture of gas, particularly air, and at least one pulverulent additive to the foamed aminoplast resin being produced while the latter is in a shaped but not fully hardened condition. The aminoplasts are the water-soluble resins obtained by condensation of urea and/or thiourea with formaldehyde in the presence of catalysts and at an elevated temperature. The foamed-up foaming agent is any foaming agent in solution or dispersion which has been foamed, e.g. by beating up or stirring. Suitable additives are surface-active grease-free soot, dry resin, glue, aminoplast resin precondensate powder which has been ground to micro-fineness and which optionally has been modified with organic or inorganic substances, particularly substances having hydraulic setting action, furfural-modified aminoplast resin, foamed polystyrene in pellet form or foamed polystyrene waste, water-soluble polyester and/or phenol resin and/or acrylic resin mixed with a water-soluble aminoplast resin, and a water-soluble, air-dry polyester resin, optionally in admixture with styrene and/or polyhydric alcohol and/or an oxidation agent and/or a reducing agent. Compressed gas may be added shortly before moulding or extrusion. The mixtures of gas and pulverulent additive may produce gas with the other components. In examples are used an aqueous urea-formaldehyde precondensate modified with furfural, solution of phenol-formaldehyde resin in stage A, asbestos flour, silicic acid-impregnated wood flour, aqueous ortho-phosphorioc acid, a styrene solution of a polyester, an aqueous dispersion of bitumen, aqueous solution of lauryl alkanol sulphate, aluminium sulphate, calcium carbonate, aluminium chloride, gum arabic, aqueous oxalic acid solution, gypsum powder, grease-free soot and sodium silicate solution.ALSO:Nitrogenous or mixed fertilizers and trace elements are incorporated into foamed aminoplasts which are produced and have their cellular structure modified by mixing a foamed up foaming agent, a water soluble aminoplast resin and a hardening agent and during or after the admixing of the reaction components leading to the hardening of the foamed aminoplast resin produced and shortly before injection moulding or extrusion, adding a dry mixture of gas and at least one pulverulent additive, containing the fertilizers, continuously to the foamed aminoplast resin being produced, while the latter is in a shaped but not fully hardened condition. Suitable fertilizers are crotonylidene-diurea or urea compounds with paraformaldehyde and acetaldehyde, casein, leather flour, chlorides, sulphates, phosphates, nitrates, aminoplast resin, and cellulose. Seeds and bulbs may be incorporated into the foam.ALSO:Disinfectants, bactericidal agents and poisons are incorporated into foamed aminoplasts which are produced and have their cellular structures modified by mixing a foamed-up foaming agent, a water soluble aminoplast resin and a hardening agent and, during or after the admixing of the reaction components leading to the hardening of the foamed aminoplast resin produced and shortly before injection moulding or extrusion, adding a dry mixture of gas and at least pulverulent additive containing the disinfectants &c., continuously to the foamed aminoplast resin being produced, while the latter is in a shaped but not fully hardened condition. Suitable disinfectants are resorcinol, calcium chloride, potassium hydroxide, 1, 1, 1-trichloro-2, 2-bis-(p-chlorophenyl)-ethane, soda-lime and formaldehyde.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL6401740A NL141561B (en) | 1964-02-24 | 1964-02-24 | PROCESS FOR PREPARING AN AMINOPLAST FOAM WITH A REINFORCED CELL STRUCTURE AND DEVICE FOR PERFORMING THIS PROCESS. |
| NL6501667A NL144968B (en) | 1965-02-10 | 1965-02-10 | IMPROVEMENT OF THE PROCESS FOR PREPARING AN AMINOPLAST FOAM WITH A REINFORCED CELL STRUCTURE ACCORDING TO MAIN PATENT NO. 141561. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| ES310089A1 true ES310089A1 (en) | 1966-02-16 |
Family
ID=26643723
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ES0310089A Expired ES310089A1 (en) | 1964-02-24 | 1965-02-23 | Method of and apparatus for the production of expanded aminoplasts and modification of the cellular structure thereof |
Country Status (8)
| Country | Link |
|---|---|
| BE (1) | BE660198A (en) |
| CH (1) | CH505173A (en) |
| DE (1) | DE1569550C3 (en) |
| ES (1) | ES310089A1 (en) |
| FI (1) | FI44956C (en) |
| GB (1) | GB1108503A (en) |
| LU (1) | LU48020A1 (en) |
| SE (2) | SE306829B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2752311C3 (en) * | 1977-11-23 | 1982-05-13 | Irkutskij gosudarstvennyj naučno-issledovatel'skij institut redkich i cvetnych metallov (IRGIREDMET), Irkutsk | Process for the production of foam and device for carrying out the process |
| US8143335B2 (en) | 2003-03-28 | 2012-03-27 | Momentive Specialty Chemicals Inc. | Adhesive composition |
| EP2836310B1 (en) * | 2012-04-11 | 2020-08-19 | FASD. BW Beheer B.V. | Device provided with a flow resisting check valve and method for applying a coating to a surface |
| NL2008628C2 (en) * | 2012-04-11 | 2013-10-15 | Fasd Bw Beheer B V | FOAM HEAD WITH SEVERAL FLOW OUTLETS AND DEVICE AND METHOD FOR APPLYING SPRAY LAYER TO A SURFACE PROVIDED WITH SUCH A FOAM LEVEL FOR USE IN SUCH DEVICE AND METHOD. |
-
1964
- 1964-02-27 SE SE240764A patent/SE306829B/xx unknown
- 1964-02-28 FI FI41964A patent/FI44956C/en active
-
1965
- 1965-02-13 DE DE1965W0038550 patent/DE1569550C3/en not_active Expired
- 1965-02-17 GB GB686765A patent/GB1108503A/en not_active Expired
- 1965-02-18 LU LU48020A patent/LU48020A1/xx unknown
- 1965-02-23 ES ES0310089A patent/ES310089A1/en not_active Expired
- 1965-02-23 CH CH260265A patent/CH505173A/en not_active IP Right Cessation
- 1965-02-24 BE BE660198D patent/BE660198A/xx not_active IP Right Cessation
- 1965-03-18 SE SE350265A patent/SE317815B/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| DE1569550B2 (en) | 1974-12-12 |
| LU48020A1 (en) | 1965-04-20 |
| BE660198A (en) | 1965-06-16 |
| SE317815B (en) | 1969-11-24 |
| SE306829B (en) | 1968-12-09 |
| FI44956C (en) | 1972-02-10 |
| CH505173A (en) | 1971-03-31 |
| DE1569550A1 (en) | 1970-10-15 |
| GB1108503A (en) | 1968-04-03 |
| FI44956B (en) | 1971-11-01 |
| DE1569550C3 (en) | 1978-10-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4040850A (en) | Production of porous gypsum moldings | |
| US4043825A (en) | Production of foamed gypsum moldings | |
| GB1108503A (en) | Method of and apparatus for the production of expanded aminoplasts and modification of the cellular structure thereof | |
| US4071480A (en) | Hardener for production solid foams or compact structure from aqueous solutions | |
| RU2127237C1 (en) | Method of producing foam concrete with use of protein foaming agent | |
| GB989799A (en) | A process for producing foam bodies from sulphite waste liquor and a foam product produced according to the process | |
| GB1115500A (en) | Method of and apparatus for the production of expanded aminoplasts and modification of the cellular structure thereof | |
| GB1303869A (en) | ||
| RU2140943C1 (en) | Composition for preparation of heat-insulating material | |
| RU2237033C2 (en) | Raw mix for heat-insulation materials and a method for preparation thereof | |
| RU2083613C1 (en) | Composition for production of artificial porous fillers | |
| RU2072375C1 (en) | Composition for foamed plastic material | |
| SU1288171A1 (en) | Polymer-impregnated concrete mix | |
| GB1384318A (en) | Phenolic resin foams | |
| NO126504B (en) | ||
| SU963179A1 (en) | Soluble glass binder | |
| GB742803A (en) | Improvements in or relating to foamed synthetic resins | |
| KR100496646B1 (en) | Lightweight foaming concreat | |
| SU1728473A1 (en) | Polymer plugging-back compound | |
| SU1047938A1 (en) | Press-mixture for making chip boards | |
| JP3041339U (en) | Synthetic wood | |
| SU1449559A1 (en) | Heat-insulation material | |
| SU1539193A1 (en) | Foaming agent for rendering concrete mix porous | |
| SU948951A1 (en) | Polymer concrete mix | |
| JPS56151733A (en) | Preparation of phenolic resin foam |