Process for the production of polyurethane silicate foams and resinous products utilizing aldehyde-broken down alkali metal cellulose silicate polymer

The process for the production of polyurethane silicate foam by the following steps:

• (a) mixing and reacting 1 to 99 parts by weight of aldehyde-broken down alkali metal cellulose silicate copolymer, which is produced by heating a mixture of 3 parts by weight of a cellulose-containing plant, 2 to 5 parts by weight of an alkali metal hydroxide and 1 to 2 parts by weight of an oxidated silicon compound to 150.degree. to 220.degree. C. while agitating for 5 to 60 minutes thereby producing a broken down alkali metal cellulose silicate polymer which is then reacted with an aldehyde in ratio of 2 parts by weight of the broken down alkali metal cellulose silicate polymer to 1 to 5 parts by weight the aldehyde to produce the aldehyde-broken down cellulose silicate copolymer, and 50 to 99 parts by weight of an organic polyisocyanate thereby producing an isocyanate-terminated polyurethane silicate prepolymer,
• (b) mixing and reacting up to 10% by weight of an initiator with the isocyanate terminated polyurethane silicate prepolymer thereby producing a polyurethane silicate foam.