Soil release promoting pet-poet copolymer, method of producing s

Details Soil release promoting pet-poet copolymer, method of producing s Soil release promoting pet-poet copolymer, method of producing s

1986-08-28

1988-11-15

Lieberman, Paul

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

25217423, 252DIG15, 525408, 528279, 528285, C08G 6304, C08G 6334, C08G 6532, C08L 7102

Patent

active

047850604

ABSTRACT:
A soil release promoting copolymer of polyethylene terephthalate and polyoxyethylene terephthalate (PET-POET) having a weight average molecular weight in the range of 15,000 to 35,000, and a PET:POET molar ratio of about 2:1 to 6:1, is prepared by reacting polyethylene terephthalate with polyethylene glycol in the presence of a catalyst system including both antimony trioxide and calcium acetate or both titanium isopropoxide and sodium isopropoxide. The PET-POET copolymer provides improved soil release properties for oily and greasy stains from polyester fabrics at high and low wash temperatures and is stable even at high alkalinity levels. The starting PET can advantageously be obtained from scrap bottles.

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