Thin-walled ovenable parts
AssigneeMinnesota Mining and Manufacturing Company
InventorGene H. Shipman
Life of this patent
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Abstract
Thin-walled ovenable parts made from polybutylene terephthalate.
Claims3
A shaped, thin-walled, ovenable article prepared by the electrostatic deposition of a composition containing, in addition to optionally present inert filler, not less than 80 percent by weight of polybutylene terephthalate and effective amounts of both a stabilizer and an antioxidant, the sum of the amounts of stabilizer and antioxidant therein being not more than about one percent by weight, said composition having
- 1. a melt flow factor of about 20 grams per 10 minutes or greater,
- 2. a crystallization rate factor (t.sub.50) of about 1-3 minutes,
- 3. a linear thermal contraction factor of 0.015-0.025 cm/cm,
- 4. a logarithmic viscosity number greater than 0.6,
- 5. a heat deflection resistance factor of about 100.degree.-200.degree. C at 4.6 kg per square centimeter fiber stress,
- 6. a m.p. of 220.degree.-230.degree. C and
- 7. a glass transition temperature (T.sub.g) in the range of 20.degree.-40.degree. C.
A shaped, thin-walled, ovenable article prepared by the electrostatic deposition of a composition containing, in addition to optionally present inert filler, not less than 80 percent by weight of polybutylene terephthalate and effective amounts of both a stabilizer and an antioxidant, the sum of the amounts of the stabilizer and the antioxidant therein being from about 0.1 to 0.5 percent by weight, said composition having
- 1. a melt flow factor of about 20 grams per 10 minutes or greater,
- 2. a crystallization rate factor (t.sub.50) of about 1-3 minutes,
- 3. a linear thermal contraction factor of 0.015-0.025 cm/cm,
- 4. a logarithmic viscosity number greater than 0.6,
- 5. a heat deflection resistance factor of about 100.degree.-200.degree. C at 4.6 kg per square centimeter fiber stress,
- 6. a m.p. of 220.degree.-230.degree. C and
- 7. a glass transition temperature (T.sub.g) in the range of 20.degree.-40.degree. C.
Dependencies are inferred from the claim text.