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US 4,377,674 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.
Claims23
The process for the production of polyurethane silicate products by the following steps:
- (a) mixing and reacting the following components, thereby producing a polyhydroxy lignin-cellulose silicate polymer;
- (i) a broken-down alkali metal plant silicate polymer produced by heating a mixture of 3 parts by weight of a 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 200.degree. C. while agitating for 5 to 60 minutes;
- in an amount of 100 parts by weight;
- (ii) an epoxide compound;
- in an amount of 1 to 3 parts by weight;
- (iii) a Lewis acid, in an amount wherein the pH of the mixture of Components (i), (ii) and (iii) is 5 to 6;
- (b) mixing and reacting 100 parts by weight of the polyhydroxy lignin-cellulose silicate polymer of step (a) and 1 to 600 parts by weight of a compound containing at least 2 isocyanate groups, or polyisothiocyanate, thereby producing a polyurethane silicate product.
4 more elements
The process of claim 1 wherein 100 parts by weight of the polyhydroxy lignin-cellulose silicate polymer of step (a) of claim 26 are mixed and reacted with 1 to 50 parts by weight of a polycarboxylic acid, and up to 50 parts by weight of a polycarboxylic acid anhydride, thereby producing a polyester resin;
- this is then added in step (b) of claim 1 in place of the polyhydroxy lignin-cellulose silicate polymer.
Dependencies are inferred from the claim text.