Increasing the useful range of cationic photoinitiators in stere

Details Increasing the useful range of cationic photoinitiators in stere Increasing the useful range of cationic photoinitiators in stere

1995-06-21

1998-01-06

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Stereolithographic shaping from liquid precursor

264308, B29C 3508, B29C 4102

Patent

active

057051160

ABSTRACT:
Polymer precursor formulations suitable for stereolithography may be prepared from compositions containing vinyl ether functionalized compounds and epoxy functionalized compounds plus an effective mount of a cationic photoinitiator and an ultraviolet light-absorbing compound to provide a predetermined depth of cure. Preferably, the ultraviolet light-absorbing compound is anthracene or its derivatives. Anthracenes having pendant alkoxy groups are preferred for use with light wavelengths greater than 360 nm, particularly 9,10-dimethoxy-2-ethyl anthracene.

REFERENCES:
patent: 4575330 (1986-03-01), Hull
patent: 5036112 (1991-07-01), Dougherty et al.
patent: 5079129 (1992-01-01), Roth et al.
patent: 5371115 (1994-12-01), Meier et al.
Crivello, "Advances in Polymer Science", 62, pp. 1-48 (1984).
U.S. Ser. No. 07/661,766, filed Feb. 27, 1991.
U.S. Ser. No. 07/693,890, filed May 1, 1991.
U.S. Ser. No. 07/855,392, filed Mar. 26, 1992.

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