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US 4,292,214 AGranted
Process for the production of polyurethane products
OwnerDavid H. Blountinventor
Life of this patent
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Abstract
Polyurethane resinous and foam products are produced by reacting lignin-cellulose polyepoxy resins with polyisocyanates.
Claims31
The process for the production of polyurethane products by mixing and reacting the following components:
- A:
- 1 to 200 parts by weight of a lignin-cellulose polyepoxy resin which is produced by mixing and reacting 10 to 200 parts by weight of a polyfunctional epoxide compound and 50 parts by weight of broken-down alkali metal plant polymer;
- B:
- 50 to 100 parts by weight of a polyisocyanate or polyisothiocyanate.
1 more element
Dependencies are inferred from the claim text.