Process for eliminating haze from articles made of cellulose ace

Details Process for eliminating haze from articles made of cellulose ace Process for eliminating haze from articles made of cellulose ace

1981-07-23

1982-11-02

Lusignan, Michael R.

Plastic and nonmetallic article shaping or treating: processes

Treating shaped or solid article

Solvent polishing type

264 13, 264 26, 264343, 264346, 252170, 252171, 8519, 156668, 536 65, 536 76, B29C 2500, B29D 1100

Patent

active

043572952

ABSTRACT:
Removal of haze from plastic articles made of cellulose acetate butyrate, such as light polarizing sunglass lenses made of cellulose acetate butyrate and polyvinyl alcohol, is accomplished by immersing said plastic articles in a substantially water-free bath composition at least 70 weight percent of which comprises an active solvent and a carrier solvent, the former being methyl alcohol, ethyl alcohol, propyl alcohol, butyl alcohol, or any mixture thereof, and the latter being ethylene glycol, glycerol, tricresyl phosphate, butyl phthalate, or any mixture thereof. Preferred values of the relative proportions of the active solvent and the carrier solvent are in the range of 90-5 and 10-95 weight percent, respectively, and more preferably, 80-10 and 20-90 weight percent, respectively.

REFERENCES:
patent: 2651811 (1953-09-01), Coney
patent: 2790727 (1957-04-01), Hilborn
patent: 4245991 (1981-01-01), Haddad et al.

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