Ultraviolet light absorbing agents, method for making, compositi

Details Ultraviolet light absorbing agents, method for making, compositi Ultraviolet light absorbing agents, method for making, compositi

1984-10-09

1985-06-25

Lesmes, George F.

Stock material or miscellaneous articles

Composite

Of silicon containing

428412, 428429, 525266, B32B 904

Patent

active

045254265

ABSTRACT:
A method is provided for making certain methoxy-substituted silyl benzophenones useful as ultraviolet light absorbing agents for silicone hardcoat formulations. The methoxy-substituted benzophenones have been found to more readily equilibrate into silicone hardcoat formulations without adversely affecting the shelf-life of the resulting formulation. The ultraviolet light absorbing agents are obtained by equilibrating a mixture of methanol and trialkoxysilyl-substituted benzophenone in the presence of an acid catalyst. The resulting UV stabilized silicon hardcoat formulations also provide silicone hardcoated plastic articles having improved thermoformability, resistance to abrasion, and environmental degradation.

REFERENCES:
patent: 4277287 (1981-07-01), Ashby et al.
patent: 4278804 (1981-07-01), Ashby et al.
patent: 4369228 (1983-01-01), Ashby
patent: 4477499 (1984-10-01), Dain et al.

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