Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1998-03-25
1999-08-03
Short, Patricia A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525444, 521 485, 528297, 528302, C08G 6391, C08G 63183, C08J 1124
Patent
active
059326662
ABSTRACT:
This invention is a thermoplastic saturated polyester low profile additive (low profile additive) useful in sheet molding compounds for parts, especially vehicle parts. The additive has a major component derived from aromatic compounds such as terephthalic acid including recycled polyethylene terephthalate. Asymmetrical glycols are an important ingredient and can be used to digest recycled PET to make oligomeric glycols which are reacted with acids having fewer than 12 carbon atoms to make one of the low profile additives of this invention.
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W. Krolikowski & M Pawlak, "The Shrinkage Compensation Mechanism in Low Profile U.S Resin Systems" Translated from Kunsstoffe 73 (1983) 1, pp. 42-47.
Atkins et al, "Mechanism of Low Profile Behavior Influence of Thermoplastic Physical Properties on Performance in Poleptive Molding" 31st Annual Technical Conference 1976 Reinforced Plastics/Composites Institute. The Society of Plastics Ind. Inc., Sec. 2-E pp. 1-9.
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Ashland Inc.
Connaughton Martin
PIcken Mary E.
Short Patricia A.
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