Process for the production of alkali metal-cellulose-silicates and their reaction products

• US 4,243,757 A
• Filed: 01/15/1980
• Issued: 01/06/1981
• Est. Priority Date: 04/12/1979
• Status: Expired due to Term

• Current Assignee: David H. Blount
• Original Assignee: David H. Blount
• Inventors: Blount, David H.
• Primary Examiner(s): Foelak, Morton
• Application Number:
  US06/112,290
• Time in Patent Office: 357 Days
• Field of Search: 260/9, 260/37 N, 536/32, 536/43, 536/44, 536/30, 528/10, 528/31, 521/154, 521/155
• US Class Current: 521/154
• CPC Class Codes: C08G 18/6484 Polysaccharides and derivatives thereof
• CPC Class Codes: C08G 2101/00 Manufacture of cellular products
• CPC Class Codes: C08J 2301/02 Cellulose; Modified cellulose
• CPC Class Codes: C08J 9/02 using blowing gases generated by the reacting monomers or modifying agents during the preparation or modification of macromolecules

Abstract

Small particles of cellulose-containing plants, fine granular oxidated silicon compounds and an alkali metal hydroxide are mixed, then heated to 150° C. to 220° C. while agitating until the plant particles soften or melt, thereby producing an alkali metal cellulose silicate condensation product.

Claims

1. 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°

C. to 220°

C. while agitating for 5 to 60 minutes, thereby

(c) producing a water-soluble alkali metal-cellulose-silicate condensation product;

adding water to produce 10 parts by weight of an aqueous solution, containing 20% to 60% by weight of the alkali metal-cellulose-silicate condensation product, then

(e) mixing the aqueous alkali metal-cellulose-silicate solution with 10 to 100 parts by weight of an isocyanate-terminated polyurethane prepolymer and 0.001 to 0.01 parts by weight of an amine allowed to react, thereby

(f) producing a polyurethane-cellulose-silicate solid or solid product.

2. The product produced by the process of claim 1.

3. The process of claim 1 wherein the isocyanate-terminated polyurethane prepolymer is selected from the group consisting of an isocyanate-terminated polyester, isocyanate-terminated polyether, isocyanate-terminated polybutadiene, isocyanate-terminated polysulfide and mixtures thereof.

4. The process of claim 1 wherein the alkali metal hydroxide is selected from the group consisting of sodium hydroxide, potassium hydroxide and mixtures thereof.

5. The process of claim 1 wherein the oxidated silicon compound is selected from silica, natural silicates containing free silicic acid radicals, sodium silicate, potassium silicate and mixtures thereof.