Coating processes – Electrical product produced – Integrated circuit – printed circuit – or circuit board
Patent
1976-01-14
1978-02-21
Smith, Ronald H.
Coating processes
Electrical product produced
Integrated circuit, printed circuit, or circuit board
427 44, 427242, 427385R, 63 32, 63DIG3, B05D 306, A44C 1700
Patent
active
040753654
ABSTRACT:
A turquoise is impregnated with a monomeric diester having two spaced apart polymerizable monoolefinic groups, said diester having a plurality of supplemental hydrophillic groups and a volatility corresponding to a boiling point within a range from about 150.degree. C to about 300.degree. C. Whatever moisture may be sorbed on the turquoise is encapsulated within the plastic during the in-situ polymerization, inasmuch as such sorbed moisture can associate with such supplemental hydrophillic groups having an affinity for water. The dimethacrylate ester of triethylene glycol has two supplemental ether groups which tend to have affinity for water. Thus the monomer is sorbed on surfaces displacing any sorbed moisture in the internal pores or fissures in the turquoise, whereby the impregnation of the turquoise is feasible without critical control of vacuum drying and/or related preparatory steps. Thus one overcomes prior difficulties connected with drying the turquoise, evacuating the turquoise, preconditioning the turquoise in a warm water bath and the multi-stage treatment for polymerization. The diester thus impregnated into the turquoise can be adequately polymerized to a weather resistant composite by catalytic, thermal, or radiation initiation of the polymerization. The heat of polymerization is so small that gems are not impaired thereby.
REFERENCES:
patent: 3935364 (1976-01-01), Proksch et al.
Breault Homer
Witt Alvin E.
Atlantic Richfield Company
Ewbank John R.
Lawrence Evan K.
Smith Ronald H.
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