Urethane sealants or coating admixtures having improved shelf st

Details Urethane sealants or coating admixtures having improved shelf st Urethane sealants or coating admixtures having improved shelf st

1989-10-10

1990-08-28

Jacobs, Lewis T.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

524265, C08K 529

Patent

active

049526219

ABSTRACT:
Polyurethane sealant and coating compositions made from blocked isocyanate-terminated prepolymers have improved shelf stability when an effective amount of a carbodiimide is utilized therewith. Such compositions and coating materials can be stored in sealed containers or cartridges for relatively long periods of time, for example in excess of five or six months, without significant loss of curability which adversely affects physical properties upon cure. One part as well as two part polyurethane sealant and coating compositions are stabilized by the addition of the carbodiimide stabilizing agent whereas the addition of an organosilane abates viscosity increase during storage.

REFERENCES:
patent: 3193522 (1965-07-01), Neumann et al.
patent: 3193524 (1965-07-01), Holtschmidt et al.
patent: 3193525 (1965-07-01), Kallert et al.
patent: 3267078 (1966-08-01), Damusis
patent: 3378517 (1968-04-01), Knipp et al.
patent: 4507443 (1985-03-01), Barron et al.
Article, "Advances in Polyurethane Technology", Maclaren and Sons Ltd., 1968, pp. 280-282, 285, 286, Buist et al.

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