Finely dispersed shell/core solid additives in polymers and prod

Details Finely dispersed shell/core solid additives in polymers and prod Finely dispersed shell/core solid additives in polymers and prod

1999-09-27

2000-12-12

Merriam, Andrew E. C.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

523201, 523205, 524515, 524520, 524537, 524539, 524540, 524546, 525146, 525169, 525197, 525199, C08L 7112, C08L 6700, C08L 2718, C08K 910

Patent

active

061600385

ABSTRACT:
A method for dispersing solid forms of additives in polymers involves adding dispersions or solutions of additive(s) to a solution of polymer in a tubular mixer (preferably in the presence of a stationary mixer). The mixer leads to a steam precipitation step wherein all fluid ingredients in the mixture are volatilized leaving the solid additive and resin in the desired ratio. This results in a uniform dispersion of the additives in the polymer matrix. As a result of the high dispersion, physical properties of a thermoplastic resin, to which the polymer matrix has been added are preserved. In one illustration, PTFE as a drip inhibitor additive, is added to polycarbonate to obtain a highly dispersed PTFE concentrate of improved drip-inhibition without loss of mechanical properties when added to a thermoplastic molding resin.

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