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US 4,359,548 AGranted
Process for the production of polyester resins
OwnerDavid H. Blountinventor
Life of this patent
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Abstract
Polyester resins are produced by chemically reacting a broken-down alkali metal lignin-cellulose polymer, a substituted organic hydroxy compound and a polycarboxylic acid compound and/or a polycarboxylic acid anhydride. Polyester resins may be used as molding powder, as coating agents and to produce polyurethane foams.
Claims21
The process for the production of polyurethane resinous products by the following steps:
- (a) heating and reacting 10 to 50 parts by weight of a broken-down alkali metal and/or a broken-down alkali metal cellulose polymer produced by mixing 3 parts by weight of a cellulose containing plant or plant derivative with 2 to 5 parts by weight of melted alkali metal hydroxide, then heating the mixture at from 150.degree. C. to 220.degree. C. while agitating for 5 to 60 minutes, with 10 to 50 parts by weight of a substituted organic hydroxy compound which contains at least one substitute which will split off in the reaction, then
- (b) adding, heating and reacting 10 to 50 parts by weight of polycarboxylic acid and/or polycarboxylic acid anhydride, thereby producing polyester resinous product, then
- (c) adding and reacting 50 parts by weight of an organic polyisocyanate or polyisothiocyanate with 1 to 95 parts by weight of the polyester resinous product, thereby producing
- (d) polyurethane resinous product.
1 more element
Dependencies are inferred from the claim text.