Method or decreasing the cyclic oligomer content in polyester product
AssigneeNan Ya Plastics Corporation
InventorZo-Chun Jen
Life of this patent
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Abstract
The present invention relates to a method for decreasing the cyclic oligomer content level in the manufacturing process of polyethylene terephthalate (PET) and in the PET products produced from said process by adding calcium phosphate at least one selected from the group consisting of a Ca3(PO4)2 structure and a Ca5OH(PO4)3 structure, and a carboxy phosphonic acid having a structure (1) as follows: wherein R1, R2, and R3 are alkyls or hydrogen atoms and R is an alkyl. The method of the prevent invention restrains the production of cyclic oligomers in the polyester chips produced and also decreases the cyclic oligomers regenerated in the rear-end melting process stage of the invention.
Claims14
A method for decreasing cyclic oligomer content in polyester products comprising:
- adding, during the manufacturing process of polyethylene terephthalate, calcium phosphate at least one selected from the group consisting of a Ca3(PO4)2 structure, a Ca5OH(PO4)3 structure and a carboxy phosphonic acid with a structure (1) as follow:
- wherein R1, R2, and R3 are alkyls or hydrogen atoms and R is an alkyl.
A method for decreasing cyclic oligomer content in polyester products comprising:
- adding, during the manufacturing process of polyethylene terephthalate, calcium phosphate, P1 and carboxy phosphonic acid with a structure (1) as follow:
- wherein R1, R2, and R3 are alkyls or hydrogen atoms and R is an alkyl and said P1 compound with a structure as follow:
Dependencies are inferred from the claim text.