Process for making and/or modifying polyurethanes

Details Process for making and/or modifying polyurethanes Process for making and/or modifying polyurethanes

1977-04-04

1979-05-29

Cockeram, H. S.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having at least one -n=c=x group as well as...

260 23, 528492, C08G 1882, C08G 1832, C08J 1104

Patent

active

041567684

ABSTRACT:
Polyurethane resins of higher than desired molecular weight with or without gel fractions which comprise insoluble material due to crosslinking or excessive degree of polymerization are treated in the solid state with a liquid or gaseous primary or secondary amine under thermal conditions which cause aminolysis of both linear linkages and crosslinkages. By this procedure, the average molcular weights of the products can be reduced to acceptable levels. Also, if the product contains gel fractions, these too can be reduced to negligible levels. The procedure is applicable to both polyether and polyester urethanes and is effective to provide improved polymer characteristics for thermoplastic processing and solution applications.

REFERENCES:
patent: 2917471 (1959-12-01), Nelson
patent: 3117940 (1964-01-01), McElroy
patent: 3192185 (1965-06-01), Achterhof et al.
patent: 3404103 (1968-10-01), Matsudaira et al.
patent: 4039568 (1977-08-01), Sakai et al.
patent: 4046741 (1977-09-01), Scher

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