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US 4,383,078 AGranted
Process for the production of alkali metal polyhydroxy lignin-cellulose polymer
OwnerDavid H. Blountinventor
Life of this patent
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Abstract
Alkali metal polyhydroxy lignin-cellulose polymer is produced by reacting an organic polyhydroxy compound with broken-down alkali metal lignin-cellulose polymer. The alkali metal polyhydroxy lignin-cellulose polymer will react with polyisocyanate to produce foam products which may be used for thermal or sound insulation.
Claims30
The process for the production of alkali metal polyhydroxy lignin-cellulose polymer by mixing, heating and reacting the following components:
- (a) In an amount of 50 parts by weight, broken-down alkali metal plant polymer which has been produced by mixing 2 to 5 parts by weight of an alkali metal hydroxide, selected from the group consisting of sodium hydroxide, potassium hydroxide and mixtures thereof, with 3 parts by weight of cellulose-containing plant particles, then heating the mixture at from 150.degree. C. to 220.degree. C. while agitating for 5 to 60 minutes;
- (b) In an amount of 10 to 200 parts by weight, an organic polyhydroxy compound;
- the mixture is heated at a temperature between ambient temperature and the boiling temperature of the organic polyhydroxy compound while agitating for 30 to 120 minutes.
Dependencies are inferred from the claim text.