Additives for Plastics. New Developments - download pdf or read online

By Raymond B. Seymour

ISBN-10: 012637502X

ISBN-13: 9780126375022

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3 0 . D e a n i n , R. , Shah, H. , and P a t e l , N. , SPE A N T E C , 2JL, 118 ( 1 9 7 5 ) . 3 1 . D a g d i g i a n , J. , and D e a n i n , R. , ACS C o a t i n g s & P l a s t i c s P r e p r i n t s , 3_5 ( 2 ) , 90 (1975) . 3 2 . D e a n i n , R. , B a r d o l i w a l l a , D. , SPE A N T E C , 21 105 ( 1 9 7 5 ) . ADDITIVES FOR PLASTICS, VOLUME 2 EFFECT OF ADDITIVES ON VISCOSITY OF FILLED RESINS Edwin P. Plueddemann Gary L. Stark Dow Corning Corporation Midland, Michigan I. A. INTRODUCTION The Total Picture Applications of "coupling agents" for surface modifica­ tion of fillers and reinforcements in plastics have generally been directed towards improved mechanical strength and chem­ ical resistance of composites related to improved adhesion across the interface.

On the other h a n d , m o l e c u l a r w e i g h t and m o l e c u l a r size of the p l a s t i ­ cizer m o l e c u l e g e n e r a l l y correlated w i t h h i g h - t e m ­ p e r a t u r e p r o p e r t i e s of the p l a s t i c i z e d s y s t e m : melt v i s c o s i t y and heat d e f l e c t i o n t e m p e r a t u r e ( 2 8 ) . One p r a c t i c a l result of these r e l a t i o n s h i p s is 45 Recent A d v a n c e s in Plasticizers the s u c c e s s f u l use of h i g h l y - a r o m a t i c , h i g h - m e l t i n g point esters as solid p l a s t i c i z e r s for rigid P V C , to improve m e l t p r o c e s s a b i l i t y w i t h m i n i m a l s a c r i ­ fice in e n d - u s e p r o p e r t i e s .

Ethylene-vinyl acetate copolymers from several sources were used. These will be designated EVA-12, EVA-IS, EVA-2S, EVA-33, and EVA-40, in which the number corresponds to the percent vinyl acetate in the copolymer. other materials were standard commercial ingredients used as received. The silica and EVA compounds were mixed in standard rubber processing equipment. The polymer was fluxed in a B-size Banbury preheated to 70° C. HS-200 silica, coupling agent and coagent were added at 1 minute, followed by zinc oxide, zinc stearate, and stearic acid at 2 minutes.

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Additives for Plastics. New Developments by Raymond B. Seymour


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