Polyester resin molding compositions and molded articles formed

Details Polyester resin molding compositions and molded articles formed Polyester resin molding compositions and molded articles formed

1991-08-14

1992-05-19

Michl, Paul R.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

524318, C08K 515

Patent

active

051150042

ABSTRACT:
Polyester resin molding compositions exhibiting exceptional low temperature physical properties (i.e., flexibility and toughness) and satisfactory mold-release properties include a melt-blend of a polyester base resin (preferably one which predominantly contains polybutylene terephthalate units), a polyester elastomer (preferably a copolyester having hard and soft segments), and a mold-release effective amount of a sorbitan ester (preferably an ester reaction product of a sorbitan with fatty acid having at least 12 carbon atoms). The sorbitan ester most preferably has a hydroxyl value of between 50 to 400, exclusive, so that blooming during injection molding operations (e.g., a predrying stage) is minimized (if not eliminated entirely). Molded articles formed of the compositions of this invention may be used in a variety of applications, for example, as parts for the automotive and/or electronics industries.

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