Rohm and Haas Company

Chao Jen Chung

Edwin Hugh Nungesser

Edward Ewart LaFleur

Edward Greer

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/mm. The composition also contains a film-forming polymer having Tno greater than 80&#xb0; C. The refractive index difference between the polymeric particles and the film-forming polymer is at least 0.04.

UV-reflecting compositions

A composition comprising polymeric particles having an average particle diameter from 0.5 to 30 &#x3bc;m and Vicker's scale hardness from 100 to 700 Kgf/mm. The composition also contains a film-forming polymer having Tno greater than 80&#xb0; C. The average refractive index difference measured from 400 nm to 1100 nm between the polymeric particles and the film-forming polymer is no greater than 0.04.

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North Wales, PA, United States of America

Chao Jen Chung