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US 8,795,829 B2Granted
UV-reflecting compositions
AssigneeRohm and Haas Company
InventorsChao Jen Chung, Edward E. Lafleur, Edwin Nungesser
Life of this patent
Estimating the term…
Abstract
A composition containing polymeric particles. The polymeric particles have an average particle diameter from 30 to 300 nm and a Vicker's scale hardness from 100 to 700 Kgf/mm2. The composition also contains a film-forming polymer having Tg no greater than 80° C. The refractive index difference between the polymeric particles and the film-forming polymer is at least 0.04.
Claims13
A composition comprising polymeric particles having:
- (a) an average particle diameter of at least 30 nm but less than 50 nm;
- and (b) a Vicker's scale hardness from 100 to 700 Kgf/mm2;
- and a film-forming polymer having Tg no greater than 80° C.;
- wherein a refractive index difference between the polymeric particles and the film-forming polymer is at least 0.04;
- wherein the polymeric particles have Tg from −50° C. to 75° C. and at least 2 wt % polymerized residues of crosslinkers;
- and wherein a weight ratio of the film-forming polymer to the polymeric particles is from 1.2:1 to 8:1.
3 more elements
A film comprising polymeric particles having:
- (a) an average particle diameter of at least 30 nm but less than 50 nm;
- (b) a Vicker's scale hardness from 100 to 700 Kgf/mm2;
- and a continuous polymeric phase having Tg no greater than 80° C.;
- wherein a refractive index difference between the polymeric particles and the continuous polymeric phase is at least 0.04;
- wherein an average distance between the polymeric particles is from 35 to 400 nm;
- wherein the polymeric particles have Tg from −50° C. to 75° C. and at least 2 wt % polymerized residues of crosslinkers;
- and wherein a weight ratio of the continuous polymeric phase to the polymeric particles is from 1.2:1 to 8:1.
4 more elements
Dependencies are inferred from the claim text.