Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1979-01-04
1981-01-20
Jacobs, Lewis T.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
521902, 528 80, C12N 1500
Patent
active
042463653
ABSTRACT:
The present invention is directed to a method for the production of plastics, including foams, containing urethane groups and predominantly isocyanurate groups by reacting polyesters having a molecular weight of from 350 to 10,000, and containing at least two hydroxyl groups and containing phthalic acid residues and, optionally, other polyhydroxyl compounds having a molecular weight of from 400 to 10,000 and/or chain extenders having a molecular weight of from 32 to 400 with an excess of polyisocyanates in the presence of isocyanate-trimerization catalysts and optionally blowing agents, foam stabilizers and other additives, the improvement characterized in that polyesters are used whose acid components comprise at least 50%, by weight, phthalic acid residues and wherein 10 to 49%, preferably 20 to 40%, by weight, of the isocyanate groups react to form urethane groups and 51 to 90%, preferably 60 to 80%, by weight, of the isocyanate groups react to form isocyanurate groups.
REFERENCES:
patent: 3135711 (1964-06-01), Thoma et al.
patent: 3284413 (1966-11-01), Heiss
patent: 3442830 (1969-05-01), Thomas
patent: 3803098 (1974-04-01), Schmitt et al.
patent: 4026837 (1977-05-01), Zimmerman et al.
patent: 4039487 (1977-08-01), Kolakowski et al.
Dietrich Werner
Merten Rudolf
Schmitz Wolfgang
Wiedermann Rolf
Bayer Aktiengesellschaft
Gil Joseph C.
Harsh Gene
Jacobs Lewis T.
Olson R. Brent
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