US4051112A — Polyester granule for melt-shaping and process fo…

Claim 1

Independent Claim 210 words

Polyester granule for melt-shaping which is composed of a difficultly crystallizable copolyester having a minimum time for half-crystallization of at least 1 minute, and having surfaces resulting from cutting by a cutter, wherein: i. said polyester granule has an intrinsic viscosity of at least 0.55 (as measured in o-chlorophenol at 35° C), ii. said polyester granule has on its surface an oriented portion having an N-value of at least 0.04, the N-value being calculated by equation (1): N = n λ/d (1) in which n is the number of interference fringes caused by double refraction counted upon the observation through a polarizing microscope using a light source of the wavelength λ (microns), and d is the thickness (microns) of a sample prepared by slicing the granule to a predetermined thickness including a part of the cut surface of the granule and iii. the inside of the polyester granule other than the said surface portion has an N-value of not higher than 0.02, said cutting being performed under conditions which will control the surface temperature t (° C) of the extrudate to satisfy equation (2): Tg + 30° C ≧ t > Tg - 15° C (2) in which Tg is the second order transition temperature (° C) of the extrudate.

Claim 2

Dependent Claim 210 words

Polyester granule for melt-shaping which is composed of a difficultly crystallizable copolyester having a minimum time for half-crystallization of at least 1 minute, and having surfaces resulting from cutting by a cutter, wherein: i. said polyester granule has an intrinsic viscosity of at least 0.55 (as measured in o-chlorophenol at 35° C), ii. said polyester granule has on its surface an oriented portion having an N-value of at least 0.04, the N-value being calculated by equation (1): N = n λ/d (1) in which n is the number of interference fringes caused by double refraction counted upon the observation through a polarizing microscope using a light source of the wavelength λ (microns), and d is the thickness (microns) of a sample prepared by slicing the granule to a predetermined thickness including a part of the cut surface of the granule and iii. the inside of the polyester granule other than the said surface portion has an N-value of not higher than 0.02, said cutting being performed under conditions which will control the surface temperature t (° C) of the extrudate to satisfy equation (2): Tg + 30° C ≧ t > Tg - 15° C (2) in which Tg is the second order transition temperature (° C) of the extrudate.

Claim 3

Dependent Claim 47 words

The polyester granule for melt-shaping according to claim 1, in which the difficultly crystallizable co-polyester is selected from the group consisting of polyethylene terephthalate copolymerized with 2 - 50 mol% of a third component and polyethylene naphthalene-2,6-dicarboxylate copolymerized with 0.6 - 50 mol% of a third component.

Claim 4

Dependent Claim 76 words

The polyester granule for melt-shaping according to claim 1, in which the third component is selected from the group consisting of naphthalenedicarboxylic acid (excluding naphthalene-2,6-dicarboxylic acid when the copolyester is copolymerized polyethylene-2,6-naphthalate), terephthalic acid (not when the copolyester is copolymerized polyethylene terephthalate), isophthalic acid, methylterephthalic acid, diphenyldicarboxylic acid, diphenoxyethanedicarboxylic acid, diphenylsulfonedicarboxylic acid, adipic acid, sebacic and, hexahydroterephthalic acid, p-hydroxybenzoic acid, p-hydroxyethoxybenzoic acid, neopentylene glycol, tetramethylene glycol, hexamethylene glycol, cyclohexane dimethanol, diethylene glycol, 2,2-bis(4,β-hydroxyethoxyphenyl)propane and 4,4'-bis(β-hydroxyethoxy) diphenylsulfone.

Claim 5

Dependent Claim 106 words

A process for making polyester granules for melt-shaping which comprises cutting a substantially unoriented melt-extrudate of a difficultly crystallizable copolyester having a minimum time for half-crystallization of at least 1 minute with a cutter, wherein said polyester melt-extrudate has an intrinsic viscosity of at least 0.55 (as measured in o-chlorophenol at 35° C.) and the cutting of the extrudate is performed under conditions which will control the surface temperature t (° C.) of extrudate to satisfy the expression (2) below: Tg + 30° C. ≧ t > Tg - 15° C. (2) in which Tg is the second order transition temperature (° C.) of the extrudate.

Claim 6

Dependent Claim 106 words

A process for making polyester granules for melt-shaping which comprises cutting a substantially unoriented melt-extrudate of a difficultly crystallizable copolyester having a minimum time for half-crystallization of at least 1 minute with a cutter, wherein said polyester melt-extrudate has an intrinsic viscosity of at least 0.55 (as measured in o-chlorophenol at 35° C.) and the cutting of the extrudate is performed under conditions which will control the surface temperature t (° C.) of extrudate to satisfy the expression (2) below: Tg + 30° C. ≧ t > Tg - 15° C. (2) in which Tg is the second order transition temperature (° C.) of the extrudate.

Claim 7

Dependent Claim 47 words

The process according to claim 4, in which the surface temperature of the extrudate under cutting satisfies the expression (2)' below: Tg + 20° C. ≧ t > Tg - 15° C. (2)' in which Tg is the second order transition temperature (° C.) of the extrudate.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1980-09-26	1981-03-28	1981-09-27	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1984-09-26	1985-03-28	1985-09-27	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1988-09-26	1989-03-28	1989-09-27	$7700.00	Window Closed / Lapsed

Polyester granule for melt-shaping and process for the preparation thereof

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