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US 5,179,143 AGranted
Process for the preparation of compression molded materials
AssigneeBayer Aktiengesellschaft
InventorsEberhard Konig, Hanns I. Sachs, Peter Kasperek, Donald R. Larimer
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Abstract
This invention relates to a process for the preparation of compression molded materials comprising compressing a substrate with a binder based on polyisocyanates, wherein said binder comprises polyisocyanates, compounds containing at least two isocyanate reactive hydrogen atoms, and alkylene carbonates.
Claims6
A process for the preparation of compression molded materials comprising:
- i) mixing a lignocellulose-containing material with a polyisocyanate based binder, wherein said binder comprises:
- a) an aromatic polyisocyanate selected from the group consisting of toluene diisocyanate, polyphenyl polymethylene polyisocyanates, and modified aromatic polyisocyanates,
- b) a polyester or polyether containing at least two hydroxyl groups and having a molecular weight of from about 400 to about 10,000, and
- c) an alkylene carbonate, wherein the total amount of components b) plus c) is from about 10 to about 250 parts by weight per 100 parts by weight of component a), and wherein the weight ratio of component b) to component c) is from about 0.5:1.0 to about 10.0:1.0,
- ii) compressing the resultant mixture without the application of heat to form a preform, and
- iii) molding said preform under heat and pressure.
3 more elements
Dependencies are inferred from the claim text.