Method for making spectacle frame components

Details Method for making spectacle frame components Method for making spectacle frame components

1970-08-20

1977-03-22

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Random variegated coloring during molding

260 37EP, 260 47EP, 264234, 264245, 264331, B29C 900, C08G 5104

Patent

active

040137473

ABSTRACT:
A process for making spectacle frame components having reproducible color patterns by molding components using a polyepoxide, a curing agent therefor and an organic dye of a certain color, which dye is thermally degradable at a temperature between about 140.degree. C. and 250.degree. C. The molded solid component is subjected to differential heating in accordance with a first predetermined pattern to cause exposed portions to undergo a distinct change to a different color. A second dye may also be included that thermally degrades at a different temperature and the component then subjected to a second predetermined pattern at a temperature intermediate of the two degradation temperatures.

REFERENCES:
patent: 2480749 (1949-08-01), Marks
patent: 2511024 (1950-06-01), Toulmin
patent: 2560855 (1951-07-01), Flanagan
patent: 3288666 (1966-11-01), Dacey
patent: 3443936 (1969-05-01), Menold
patent: 3513060 (1970-05-01), Krystof
patent: 3678141 (1972-07-01), Metcalfe et al.

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