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US 4,382,136 AGranted
Process for the production of polyhydroxy lignin-cellulose silicate polymer
OwnerDavid H. Blountinventor
Life of this patent
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Abstract
An alkali metal broken-down plant silicate polymer is reacted with a Lewis acid and an epoxide compound to produce a polyhydroxy lignin-cellulose polymer which may be reacted with polyisocyanates to produce polyurethane silicate foam and be used for insulation.
Claims10
The process for the production of polyhydroxy lignin-cellulose silicate polymers by mixing and reacting the following components:
- (a) a broken-down alkali metal plant silicate polymer produced by heating a mixture of 3 parts by weight of a lignin cellulose-containing plant and 1 to 2 parts by weight of an oxidated silicon compound with 2 to 5 parts by weight of a melted alkali metal hydroxide to between 150.degree. C. and 220.degree. C. while agitating for 5 to 60 minutes;
- in an amount of 100 parts by weight;
- (b) an epoxide compound selected from the group consisting of alkylene oxide, epihalohydrins, styrene oxide, tetrahydrofuran and mixtures thereof;
- in an amount of 1 to 300 parts by weight;
- (c) a Lewis acid;
- in an amount wherein the pH of the mixture of Components (a), (b) and (c) is 5 to 6.
3 more elements
Dependencies are inferred from the claim text.