TH1349A - Thixotropid resins: Preparation and use in coatings. - Google Patents

Abstract

Thixotropid resins are prepared by initially reacting a high-hydroxyl alkyd resin with a predefined polyamide using a drying oil. The product is then further reacted with a small amount of polyisocyanate. Ideally, resins with greater than two functional properties can be blended with other Newtonian flowable alkyl resins to produce thixotropid coating components resistant to high ambient temperatures.

Claims (16)

1. The preparation method for suitable resins for use in organic solvent-based coating components, which will have thixotropic properties, will involve the reaction of (a) alkyd resins with hydroxyl values in the range of 30-200 mg KOH/g and acid values in the range of 2-25 mg KOH/g, prepared by the co-reaction of polyols, polybasic acids, and co-reaction materials to contain unsaturated crying oil moisture, with (b) polyamides obtained by the co-reaction of dimorphic acids and polyaldylene polyamines, and (c) polyisocyanates 0.1 - 9.5% by weight relative to the total weight of (a), (b), and (c). The relative weight ratio of hydroxyl groups and isocyanate groups in the product is determined by the reaction. The reaction of (a) and (b) and in polyisocyanate (c) is in the range of 100:5 to 100:50. 2. The process pursuant to claim 1, in which 2-5% by weight of polyisocyanates are used. 3. A procedure under claim 1 or 2 in which the polyisocyanate has a function greater than 2. 4. Any process under any of the claims in Claims 1-3 in which polyisocyanates are in polymer form. 5. The process pursuant to claim paragraph 4, in which a polymerized polyisocyanate is selected from a biuret derived from hexamethylene diisocyanate and an aductant of 1 mol of trimethylolpropane and 3 mol of toliline diisocyanate. 6. Any process under any of the claims of claims 1 through 5 in which alkyl resin (a) 80.5 -98-9% by weight and polyamide (b) 1-10% by weight, the amount of these two substances relative to the total weight of (a), (b), and (c). 7. Any of the processes under claims 1-6 where the hydroxyl concentration of the alkyl resin is in the range of 75-150 mg KOH/g and the acid concentration of the alkyl resin is in the range of 6-16 mg KOH/g. 8. Any process under claim 17 in which the polybasic acid used in the preparation of alkyl resins contains isophthasic acid. 9. Any process under any of the claims in Claims 1–8 in which the co-reactant material consists of a selected unsaturated drying oil moiate derived from drying oil, a drying oil fatty acid, or a drying oil fatty acid that is a partial ester of a polyol. 10. Resins, when prepared by any process under any of the claims in Claims 1-9. 11. Coating components consisting of a binder containing 100 - 0.5% by weight of the total weight of the resin binder as per claim 10. 12. The coating composition as per claim 11 shall consist of an alkyd resin binder containing sufficient newtonia or ology of up to 99.5% by weight of the total weight of the binder. 13. The coating components as described in Claim 11 or Claim 12 consist of aliphatic hydrocarbons as a solvent. 14. The procedures under Claim 1 are described herein in large part and refer to any of these examples. 15. The resins under claim 10, as described herein, are, in their entirety and in reference to any of these samples, 16. The coating components according to claim 11, as described herein in most respects and as referenced to any of these examples (Clause 16, 2 pages, 0 figures).