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US 4,247,657 AGranted
Process for the production of alkali metal-cellulose-silicates and their reaction products
OwnerDavid Blountinventor
Life of this patent
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Abstract
Small particles of cellulose-containing plants, fine granular oxidated, silicon compounds and an alkali metal hydroxide are mixed, then heated to 150.degree. C. to 220.degree. C. while agitating until the plant particles soften or melt, thereby producing an alkali metal cellulose silicate condensation product.
Claims33
The process for the production of polyisocyanate-cellulose-silicate products by the following steps:
- (a) mixing 3 parts by weight of a cellulose-containing plant with 1 to 2 parts by weight of an oxidated silicon compound and 2 to 5 parts by weight of an alkali metal hydroxide;
- (b) heating the mixture at 150.degree. C. to 270.degree. C. while agitating for 5 to 60 minutes, thereby;
- (c) producing a water-soluable alkali metal-cellulose-silicate condensation product;
- (d) mixing 2 parts by weight of the alkali metal-cellulose-silicate condensation product as produced in step (c) and 1 to 4 parts by weight of an organic polyisocyanate, then;
- (e) agitating for 10 to 60 minutes at a temperature between 20.degree. C. to 70.degree. C., thereby;
- (f) producing a polyisocyanate-alkali meal-cellulose prepolymer;
- then
- (g) adding 10% to 100% by weight of a curing agent, based on the weight of the prepolymer, and selected from the group consisting of water, water containing 1% to 10% by weight of an amine catalyst, water containing 10% to 60% by weight of a polyhydroxyl compound, water containing 10% to 60% by weight of silica sol, water containing up to 5% by weight of an emulsifying agent, water containing 10% to 50% by weight of sodium silicate and mixtures thereof, is added to the said prepolymer while agitating at 20.degree. C. to 80.degree. C. for 5 to 20 minutes, thereby producing a cellular solid or solid polyisocyanate-cellulose-silicate product.
5 more elements
The process for the production of polyurethane-cellulose-silicate cellular solid product by the following steps:
- (a) mixing 3 parts by weight of a cellulose-containing plant with 1 to 2 parts by weight of an oxidated silicon compound and 2 to 5 parts by weight of an alkali metal hydroxide,
- (b) heating the mixture at 150.degree. C. to 220.degree. C. while agitating for 5 to 6 minutes, thereby
- (c) producing a water-soluable alkali metal-cellulose-silicate condensation product;
- (d) mixing 1 to 3 parts by weight of the alkali metal-cellulose-silicate condensation product, as produced in step (c), 1 to 3 parts by weight of a polyol, and 1 to 3 parts by weight of an organic polyisocyanate;
- the resultant mixture is allowed to react, thereby
- (e) reducing a polyurethane-cellulose-silicate cellular solid product.
3 more elements
The process for the production of polyurethane-cellulose-silicate cellular solid or solid product by the following steps:
- (a) mixing 3 parts by weight of a cellulose-containing plant with 1 to 2 parts by weight of an oxidated silicon compound and 2 to 5 parts by weight of an alkali metal hydroxide,
- (b) heating the mixture at 150.degree. C. to 220.degree. C. while agitating for 5 to 60 minutes, thereby
- (c) producing a water-soluable alkali metal-cellulose-silicate condensation product;
- (d) mixing 1 to 4 parts by weight of the alkali metal-cellulose-silicate condensation product, as produced in step (c), and 3 parts by weight of an isocyanate-terminated polyurethane prepolymer;
- the resultant mixture is allowed to react, thereby
- (e) producing a polyurethane-cellulose-silicate cellular solid or solid product.
3 more elements
The process for the production of polyisocyanate-cellulose-silicate cellular solid or solid product by the following steps:
- (a) mixing 3 parts by weight of a cellulose-containing plant with 1 to 2 parts by weight of an oxidated silicon compound and 2 to 5 parts by weight of an alkali metal hydroxide
- (b) heating the mixture at 150.degree. C. to 220.degree. C. while agitating for 5 to 60 minutes, thereby
- (c) producing a water-soluble alkali metal-cellulose-silicate condensation product;
- (d) mixing 1 part by weight of the alkali metal-cellulose-silicate condensation product, as produced in step (c), is added to water to produce an aqueous solution containing 20% to 60% solids, then mixed with 1 to 10 parts by weight of an organic polyisocyanate or polyisothiocyanate, and the resultant mixture is allowed to react, thereby
- (e) producing a polyisocyanate-cellulose-silicate cellular solid or solid product.
2 more elements
Dependencies are inferred from the claim text.