US4286018A — Biaxially oriented poly-p-phenylene sulfide films

Claim 1

Independent Claim 53 words

A heat set biaxially oriented poly-p-phenylene sulfide film comprising predominantly a plurality of recurring units of the formula ##STR11## said film having a specific gravity of about 1.330 to 1.400 and a melt viscosity of about 100 to 600,000 poise at 300° C. and at a shear rate of 200 sec -1 .

Claim 2

Dependent Claim 53 words

A heat set biaxially oriented poly-p-phenylene sulfide film comprising predominantly a plurality of recurring units of the formula ##STR11## said film having a specific gravity of about 1.330 to 1.400 and a melt viscosity of about 100 to 600,000 poise at 300° C. and at a shear rate of 200 sec -1 .

Claim 3

Dependent Claim 37 words

The film of claim 1, wherein the haze value for a 25 micron thick film is less than 20% in the absence of any additives, and wherein said haze is substantially unchanged up to about 150° C.

Claim 4

Dependent Claim 35 words

The film of claim 1, produced by biaxially stretching to an extent of at least an area ratio of about 3 followed by heat-setting at a temperature between about 180° C. and the melting point.

Claim 5

Dependent Claim 74 words

A heat set biaxially oriented poly-p-phenylene sulfide film comprising predominantly a plurality of recurring units of the formula ##STR12## said film having a melt viscosity of about 100 to 600,000 poise at 300° C. and at a shear rate of 200 sec -1 , produced by biaxially stretching to an extent of an area ratio of about 3 to 25, followed by heat-setting at a temperature between about 180° C. and the melting point.

Claim 6

Dependent Claim 74 words

A heat set biaxially oriented poly-p-phenylene sulfide film comprising predominantly a plurality of recurring units of the formula ##STR12## said film having a melt viscosity of about 100 to 600,000 poise at 300° C. and at a shear rate of 200 sec -1 , produced by biaxially stretching to an extent of an area ratio of about 3 to 25, followed by heat-setting at a temperature between about 180° C. and the melting point.

Claim 7

Dependent Claim 120 words

A heat set biaxially oriented poly-p-phenylene sulfide film comprising predominantly a plurality of recurring units of the formula ##STR13## produced by a process which comprises (a) casting amorphous poly-p-phenylene sulfide film, (b) stretching said amorphous film within the range of about 2.0 to 5.0 times at a temperature between about 80°-120° C., so that the film birefringence in the stretching direction is between 0.05 to 0.30, thereafter (c) stretching said film in a direction transverse to that of step (b) within a range of about 1.5 to 5.0 times at a temperature between about 80°-150° C., thereby producing a biaxially stretched film, and (d) heat-setting said biaxially oriented film at a temperature between about 180° C. and the melting point.

Claim 8

Dependent Claim 120 words

A heat set biaxially oriented poly-p-phenylene sulfide film comprising predominantly a plurality of recurring units of the formula ##STR13## produced by a process which comprises (a) casting amorphous poly-p-phenylene sulfide film, (b) stretching said amorphous film within the range of about 2.0 to 5.0 times at a temperature between about 80°-120° C., so that the film birefringence in the stretching direction is between 0.05 to 0.30, thereafter (c) stretching said film in a direction transverse to that of step (b) within a range of about 1.5 to 5.0 times at a temperature between about 80°-150° C., thereby producing a biaxially stretched film, and (d) heat-setting said biaxially oriented film at a temperature between about 180° C. and the melting point.

Claim 9

Dependent Claim 30 words

The film of claim 1 or 4 or 5, wherein the non-Newtonian coefficient of said poly-p-phenylene sulfide at 300° C. is larger than about 0.9 and smaller than about 2.0.

Claim 10

Dependent Claim 45 words

The film of claim 1 or 4 or 5, wherein the melt viscosity of said poly-p-phenylene sulfide, at 300° C. and at a shear rate of 200 sec -1 , is greater than about 300 poise and smaller than about 100,000 poise without prior curing.

Claim 11

Dependent Claim 41 words

The film of claim 1 or 4 or 5, which is non-fibrillating and has a tensile strength of about 5 to 100 kg/mm 2 , and a tensile modulus of about 250 to 1,000 kg/mm 2 at least in one direction.

Claim 12

Dependent Claim 19 words

The film of claim 1 or 4 or 5, which has an ultimate elongation of about 10 to 200%.

Claim 13

Dependent Claim 29 words

A heat set biaxially oriented poly-p-phenylene sulfide film wherein the degree of planar orientation of the film measured by the X-ray pole figure method is more than about 0.50.

Claim 14

Dependent Claim 29 words

A heat set biaxially oriented poly-p-phenylene sulfide film wherein the degree of planar orientation of the film measured by the X-ray pole figure method is more than about 0.50.

Claim 15

Dependent Claim 66 words

A heat set biaxially oriented film comprising poly-p-phenylene sulfide and additive and/or filler wherein said poly-p-phenylene sulfide is composed of predominantly a plurality of recurring units of the formula ##STR14## said film having a specific gravity greater than about 1.330 and lower than about 1.400, a melting viscosity of about 100 to 600,000 poise at 300° C. and at a shear rate of 200 -1 .

Claim 16

Dependent Claim 66 words

A heat set biaxially oriented film comprising poly-p-phenylene sulfide and additive and/or filler wherein said poly-p-phenylene sulfide is composed of predominantly a plurality of recurring units of the formula ##STR14## said film having a specific gravity greater than about 1.330 and lower than about 1.400, a melting viscosity of about 100 to 600,000 poise at 300° C. and at a shear rate of 200 -1 .

Claim 17

Dependent Claim 58 words

Electric insulation material comprising a heat set biaxially oriented film consisting essentially of a high molecular weight poly-p-phenylene sulfide comprising predominantly a plurality of recurring units of the formula ##STR15## said film having a dielectric strength of greater than about 100 kV/mm and a tensile strength of greater than about 5 kg/mm 2 at least in one direction.

Claim 18

Dependent Claim 58 words

Electric insulation material comprising a heat set biaxially oriented film consisting essentially of a high molecular weight poly-p-phenylene sulfide comprising predominantly a plurality of recurring units of the formula ##STR15## said film having a dielectric strength of greater than about 100 kV/mm and a tensile strength of greater than about 5 kg/mm 2 at least in one direction.

Claim 19

Dependent Claim 69 words

Magnetic recording medium comprising a heat set biaxially oriented film consisting essentially of a high molecular weight poly-p-phenylene sulfide comprising predominantly a plurality of recurring units of the formula ##STR16## said film having a tensile modulus of greater than about 250 kg/mm 2 and a thermal linear expansion coefficient of about 2.0×10 -4 to 2.0×10 -4 mm/mm/°C. within a temperature range between 20°-150° C. at least in one direction.

Claim 20

Dependent Claim 69 words

Magnetic recording medium comprising a heat set biaxially oriented film consisting essentially of a high molecular weight poly-p-phenylene sulfide comprising predominantly a plurality of recurring units of the formula ##STR16## said film having a tensile modulus of greater than about 250 kg/mm 2 and a thermal linear expansion coefficient of about 2.0×10 -4 to 2.0×10 -4 mm/mm/°C. within a temperature range between 20°-150° C. at least in one direction.

Claim 21

Dependent Claim 52 words

A capacitor comprising a heat set biaxially oriented film consisting essentially of a high molecular weight poly-p-phenylene sulfide comprising predominatly a plurality of recurring units of the formula ##STR17## said film having an electrical dissipation factor of less than about 1.0% for 10 3 Hz from room temperature up to 150° C.

Claim 22

Dependent Claim 52 words

A capacitor comprising a heat set biaxially oriented film consisting essentially of a high molecular weight poly-p-phenylene sulfide comprising predominatly a plurality of recurring units of the formula ##STR17## said film having an electrical dissipation factor of less than about 1.0% for 10 3 Hz from room temperature up to 150° C.

Claim 23

Dependent Claim 72 words

A printed circuit board comprising a heat set biaxially oriented film consisting essentially of a high molecular weight poly-p-phenylene sulfide comprising predominantly a plurality of recurring units of the formula ##STR18## said film having a thermal dimensional shrinkage of less than about 5% at 250° C. after 30 seconds exposure, and a folding endurance under a weight of 2.5 kg/mm 2 in excess of about 500 times at least in one direction.

Claim 24

Dependent Claim 72 words

A printed circuit board comprising a heat set biaxially oriented film consisting essentially of a high molecular weight poly-p-phenylene sulfide comprising predominantly a plurality of recurring units of the formula ##STR18## said film having a thermal dimensional shrinkage of less than about 5% at 250° C. after 30 seconds exposure, and a folding endurance under a weight of 2.5 kg/mm 2 in excess of about 500 times at least in one direction.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1984-08-24	1985-02-23	1985-08-25	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1988-08-24	1989-02-23	1989-08-25	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1992-08-24	1993-02-23	1993-08-25	$7700.00	Window Closed / Lapsed

Biaxially oriented poly-p-phenylene sulfide films

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