Postcuring of unsaturated stereolithographic specimens using aqu

Details Postcuring of unsaturated stereolithographic specimens using aqu Postcuring of unsaturated stereolithographic specimens using aqu

1988-09-08

1990-11-20

McCamish, Marion C.

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

Synthetic resins

Compositions to be polymerized by wave energy wherein said...

522 85, 522 24, 522 28, 427 541, 526 91, C08F 440, B05D 306

Patent

active

049720066

ABSTRACT:
A method of curing a three-dimensional specimen of preformed cross-linked polymeric material containing polymerizable ethylenically-unsaturated material is provided in which the specimen is immersed in water having dissolved therein an amount of a water-soluble organic free-radical polymerization catalyst effective to transfer a polymerization-initiating amount of the catalyst into the preformed cross-linked polymeric material. This specimen containing the water-soluble organic free-radical polymerization catalyst is heated to a temperature causing polymerization, and is maintained at that temperature while the cure is completed. The aqueous bath preferably contains a catalyst mixture which includes a catalyst of oxidizing character in admixture with a reducing agent, such as an amine, and is maintained at a polymerization temperature of from 60.degree. C. to 100.degree. C. so that immersion of the specimen in a single bath completes the cure.

REFERENCES:
patent: 3083118 (1963-03-01), Bridgeford
patent: 4575330 (1986-03-01), Hull

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