Mixed diamine chain extender

Details Mixed diamine chain extender Mixed diamine chain extender

1985-12-16

1986-12-23

Welsh, Maurice J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

252182, 264 51, 2643281, 2643286, 2643288, 528 76, 528 83, C08G 1814

Patent

active

046312986

ABSTRACT:
Mixtures of aromatic diamines, polyurethanes made therefrom, and processes for the preparation of the polyurethanes. The mixtures of aromatic diamines of the invention comprise a first aromatic diamine having a machine gel time of about 1 to 4 seconds in a 50,000 psi modulus RIM formulation reaction and the second aromatic diamine having a slower machine gel time of about 1.5 to 15 times that of the first aromatic diamine. The mixtures provide gel times of about 2.5 to 10 seconds, suitable for filling large molds such as automotive body panels. The novel aromatic diamine mixtures allow use of larger proportions of diamine to provide polyurethanes which are rigid but not brittle at demold and have unexpectedly superior flexural modulus properties. The polyurethanes formed with the chain extender mixtures of the invention have flexural modulus superior to polyurethanes formed from either of the diamines individually.

REFERENCES:
patent: T912009 (1973-07-01), Strassel et al.
patent: 3194793 (1965-07-01), Kogon
patent: 3977989 (1976-08-01), Taub
patent: 4218543 (1980-08-01), Weber et al.

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