JPS55164207A - Styrene polymer - Google Patents

Styrene polymer

Info

Publication number
JPS55164207A
JPS55164207A JP7064079A JP7064079A JPS55164207A JP S55164207 A JPS55164207 A JP S55164207A JP 7064079 A JP7064079 A JP 7064079A JP 7064079 A JP7064079 A JP 7064079A JP S55164207 A JPS55164207 A JP S55164207A
Authority
JP
Japan
Prior art keywords
molecular weight
average molecular
polymerization
curve
exhibits
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.)
Granted
Application number
JP7064079A
Other languages
Japanese (ja)
Other versions
JPS5730843B2 (en
Inventor
Masao Atsumi
Sadanobu Kato
Yutaka Tagashira
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Denka Co Ltd
Original Assignee
Denki Kagaku Kogyo KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Denki Kagaku Kogyo KK filed Critical Denki Kagaku Kogyo KK
Priority to JP7064079A priority Critical patent/JPS55164207A/en
Publication of JPS55164207A publication Critical patent/JPS55164207A/en
Publication of JPS5730843B2 publication Critical patent/JPS5730843B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Compositions Of Macromolecular Compounds (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)

Abstract

PURPOSE: To prepare a styrene polymer useful for electrical appliances, etc. and having a weight average molecular weight/number average molecular weight ratios higher than a specific value, a specific molecular weight distribution, wherein the amounts of the both low molecular weight portion and high molecular weight are large, and improved moldability, heat resistance, stiffness, impact resistance, etc.
CONSTITUTION: Pure water and additives, e.g. a surface active agent, etc., are fed into a polymerization vessel and stirred. Styrene and a radical polymerization initiator are fed thereto and the vessel is closed. The temperature is raised to 103°C to carry out the polymerization. The temperature is further raised to 125°C to complete the polymerization and the desired polymer having a weight average molecular weight/number average molecular weight ratio of >3.0 and comprising (A) 65W80wt% of a portion having a molecular weight range of 50,000W800,000 and exhibiting a molecular weight distribution curve measured by GPC, of the trapezoid 1, and (B) ≥15wt% of a portion having a molecular weight range of ≥400,000, is obtained. The curve (a) exhibits a heat-resistant type polystyrene containing smaller amount of the high molecular weight portion and having a lowered strength, and the curve (b) exhibits an impact-resistant type polystyrene containing smaller of the low molecular weight portion and having lowered moldability.
COPYRIGHT: (C)1980,JPO&Japio
JP7064079A 1979-06-07 1979-06-07 Styrene polymer Granted JPS55164207A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7064079A JPS55164207A (en) 1979-06-07 1979-06-07 Styrene polymer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7064079A JPS55164207A (en) 1979-06-07 1979-06-07 Styrene polymer

Publications (2)

Publication Number Publication Date
JPS55164207A true JPS55164207A (en) 1980-12-20
JPS5730843B2 JPS5730843B2 (en) 1982-07-01

Family

ID=13437440

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7064079A Granted JPS55164207A (en) 1979-06-07 1979-06-07 Styrene polymer

Country Status (1)

Country Link
JP (1) JPS55164207A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS601247A (en) * 1983-06-17 1985-01-07 Asahi Chem Ind Co Ltd Styrene polymer composition
WO1985005370A1 (en) * 1984-05-21 1985-12-05 The Dow Chemical Company Impact-modified monovinylidene aromatic polymer injection molding resins
US4594391A (en) * 1984-05-21 1986-06-10 The Dow Chemical Company Impact-modified monovinylidene aromatic polymer injection molding resins
JPS6222834A (en) * 1985-07-23 1987-01-31 Kanegafuchi Chem Ind Co Ltd Polystyrene foam having excellent post-expansion moldability under heating
JPS6253307A (en) * 1985-08-30 1987-03-09 Kanegafuchi Chem Ind Co Ltd Styrene baded resin having improved moldability
US5703184A (en) * 1995-03-31 1997-12-30 Sumitomo Chemical Company, Limited Process for producing styrenic polymer

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS601247A (en) * 1983-06-17 1985-01-07 Asahi Chem Ind Co Ltd Styrene polymer composition
WO1985005370A1 (en) * 1984-05-21 1985-12-05 The Dow Chemical Company Impact-modified monovinylidene aromatic polymer injection molding resins
US4594391A (en) * 1984-05-21 1986-06-10 The Dow Chemical Company Impact-modified monovinylidene aromatic polymer injection molding resins
JPS6222834A (en) * 1985-07-23 1987-01-31 Kanegafuchi Chem Ind Co Ltd Polystyrene foam having excellent post-expansion moldability under heating
JPS6253307A (en) * 1985-08-30 1987-03-09 Kanegafuchi Chem Ind Co Ltd Styrene baded resin having improved moldability
US5703184A (en) * 1995-03-31 1997-12-30 Sumitomo Chemical Company, Limited Process for producing styrenic polymer

Also Published As

Publication number Publication date
JPS5730843B2 (en) 1982-07-01

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