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US 3,946,091 AGranted
Aromatic co-polyester articles showing reduced crazing
AssigneeUnitika Ltd.
InventorsHiroshi Sakata, Takashi Okamoto, Hirozo Hasegawa
Life of this patent
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Abstract
A blend of an aromatic co-polyester and poly(etylene terephthalate) provides molded articles of reduced crazing.
Claims14
A composition showing reduced crazing comprising an aromatic co-polyester and poly(ethylene terephthalate),
- a. the aromatic co-polyester being a resinous product represented by the formula:
- ##SPC4##
- wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R'.sub.1, R'.sub.2, R'.sub.3 and R'.sub.4, which may be the same or different, are members selected from the group consisting of hydrogen, chlorine, and bromine, and n is a positive integer which provides a resinous product;
- b. the poly(ethylene terephthalate) being present in an amount of from 0.1 to 4 weight % based on the sum of the weight of said aromatic co-polyester and the poly (ethylene terephthalate);
- and
- c. the moiety ##SPC5##
- in the above formula being terephthalic acid units and isophthalic acid units, which are present in said aromatic co-polyester at a molar ratio of about 9:1 to 1:9, respectively.
4 more elements
The composition showing reduced crazing comprising an aromatic co-polyester and poly(ethylene terephthalate),
- a. the aromatic copolyester being a resinous product represented by the formula:
- ##SPC6##
- wherein n is a positive integer which provides a resinous product;
- b. the poly(ethylene terephthalate) being present in an amount of from 0.1 to 4 weight % based on the sum of the weight of said aromatic co-polyester and the poly(ethylene terephthalate);
- and
- c. the moiety ##SPC7##
- in the above formula being terephthalic acid units and isophthalic acid units, which are present in said aromatic co-polyester at a molar ratio of about 9:1 to 1:9, respectively.
4 more elements
A method for reducing crazing of a molded article of an aromatic co-polyester comprising a resinous product represented by the formula:
- ##SPC8##
- wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R'.sub.1, R'.sub.2, R'.sub.3 and R'.sub.4, which may be the same or different, are members selected from the group consisting of hydrogen, chlorine, and bromine, and n is a positive integer which provides a resinous product;
- comprising blending from 0.1 to 4 weight % of poly(ethylene terephthalate) therewith, based on the sum of the weight of said aromatic co-polyester and said poly(ethylene terephthalate), prior to molding.
Dependencies are inferred from the claim text.