US5166238A — Styrene-based resin composition

Claim 1

Independent Claim 50 words

A syndiotactic polystyrene comprising (A) a styrene based polymer having a mainly syndiotactic configuration; and (B) 0.005 to 30 parts by weight, per 100 parts by weight of said polymer, of an antioxidant selected from the group consisting of a phosphorous containing antioxidant, a phenolic antioxidant or a combination thereof.

Claim 2

Dependent Claim 50 words

A syndiotactic polystyrene comprising (A) a styrene based polymer having a mainly syndiotactic configuration; and (B) 0.005 to 30 parts by weight, per 100 parts by weight of said polymer, of an antioxidant selected from the group consisting of a phosphorous containing antioxidant, a phenolic antioxidant or a combination thereof.

Claim 3

Dependent Claim 37 words

The syndiotactic polystyrene of claim 1 wherein said phosphorous containing antioxidant is a monophosphite or diphosphite or mixture thereof and the phenolic antioxidant is a dialkyl phenol, trialkyl phenol, diphenylmonoalkoxylphenol, a tetraalkyl phenol, or a mixture thereof.

Claim 4

Dependent Claim 28 words

The syndiotactic polystyrene of claim 2 wherein a mixture of phosphorus containing antioxidants and phenolic antioxidants in a ratio in the range of 100:1 to 0.3:1 is used.

Claim 5

Dependent Claim 29 words

The syndiotactic polystyrene of claim 1 wherein the antioxidant is a mixture of phosphorus containing antioxidants and phenolic antioxidants in a ratio in the range of 100:1 to 0.3:1.

Claim 6

Dependent Claim 16 words

The syndiotactic polystyrene of claim 1 comprising 0.005 to 5 parts by weight of the antioxidant.

Claim 7

Dependent Claim 17 words

The syndiotactic polystyrene of claim 5 wherein the polymer has a molecular weight of at least 10,000.

Claim 8

Dependent Claim 17 words

The syndiotactic polystyrene of claim 1 wherein the polymer has a molecular weight of at least 50,000.

Claim 9

Dependent Claim 17 words

The syndiotactic polystyrene of claim 1 wherein the polymer has a molecular weight of at least 100,000.

Claim 10

Dependent Claim 17 words

The syndiotactic polystyrene of claim 1 wherein the polymer has a molecular weight of at least 300,000.

Claim 11

Dependent Claim 13 words

The syndiotactic polystyrene of claim 1 which has at least 30% racemic pentad.

Claim 12

Dependent Claim 13 words

The syndiotactic polystyrene of claim 10 which has at least 50% racemic pentad.

Claim 13

Dependent Claim 29 words

The syndiotactic polystyrene of claim 1, wherein the polymer has a molecular weight of at least 100,000, at least 50% racemic pentad and a crystallinity of less than 25%.

Claim 14

Dependent Claim 53 words

The styrene-based resin composition of claim 1 wherein the phosphorus-containing antioxidant and the phenolic antioxidant are present in a total amount of 0.005 to 5 parts by weight per 100 parts by weight of the styrene-based polymer, and the weight ratio of the phosphorus-containing antioxidant to the phenolic antioxidant is 100:1 to 0.3:1.

Claim 15

Dependent Claim 38 words

The composition claim 13 wherein the antioxidant component (B) further contains a sulfur-containing antioxidant and the amount of the sulfur-containing antioxidant compounded is 0.0001 to 1 part by weight per 100 parts by weight of the styrene-based polymer.

Claim 16

Dependent Claim 38 words

The composition as claimed in claim 14 wherein the resin component (A) further contains rubber and the amount of the rubber compounded is 1 to 200 parts by weight per 100 parts by weight of the styrene-based polymer.

Claim 17

Dependent Claim 43 words

The composition of claim 14 wherein the resin component (A) further contains a thermoplastic resin and/or rubber, and the amount of the thermoplastic resin and/or rubber compounded is 1 to 200 parts by weight per 100 parts by weight of the styrene-based polymer.

Claim 18

Dependent Claim 39 words

The composition of claim 16, wherein the resin component (A) further contains a thermoplastic resin and the amount of the thermoplastic resin compounded is 1 to 200 parts by weight per 100 parts by eight of the styrene-based polymer.

Claim 19

Dependent Claim 78 words

A fibrous molding produced by spinning a styrene-based resin composition comprising (A) a styrene-based polymer having mainly a syndiotactic configuration as resin component and (B) a phosphorus-containing antioxidant and a phenolic antioxidant as antioxidant wherein the total amount of the phosphorus-containing antioxidant and the phenolic antioxidant is 0.01 to 30 parts by weight per 100 parts by weight of the styrene-based polymer, and the weight ratio of the phosphorus-containing antioxidant to the phenolic antioxidant is 100:1 to 0.3.

Claim 20

Dependent Claim 78 words

A fibrous molding produced by spinning a styrene-based resin composition comprising (A) a styrene-based polymer having mainly a syndiotactic configuration as resin component and (B) a phosphorus-containing antioxidant and a phenolic antioxidant as antioxidant wherein the total amount of the phosphorus-containing antioxidant and the phenolic antioxidant is 0.01 to 30 parts by weight per 100 parts by weight of the styrene-based polymer, and the weight ratio of the phosphorus-containing antioxidant to the phenolic antioxidant is 100:1 to 0.3.

Claim 21

Dependent Claim 78 words

A molding produced by stretching a styrene-based resin composition comprising (A) a styrene-based polymer having mainly a syndiotactic configuration as resin component and (B) a phosphorus-containing antioxidant and a phenolic antioxidant as antioxidant wherein the total amount of the phosphorous-containing antioxidant and the phenolic antioxidant compounded is 0.005 to 5 parts by weight per 100 parts by weight of the styrene-based polymer, and the weight ratio of the phosphorus-containing antioxidant to the phenolic antioxidant is 100:1 to 0.3:1.

Claim 22

Dependent Claim 78 words

A molding produced by stretching a styrene-based resin composition comprising (A) a styrene-based polymer having mainly a syndiotactic configuration as resin component and (B) a phosphorus-containing antioxidant and a phenolic antioxidant as antioxidant wherein the total amount of the phosphorous-containing antioxidant and the phenolic antioxidant compounded is 0.005 to 5 parts by weight per 100 parts by weight of the styrene-based polymer, and the weight ratio of the phosphorus-containing antioxidant to the phenolic antioxidant is 100:1 to 0.3:1.

Claim 23

Dependent Claim 26 words

The molding as claimed in claim 19, wherein the resin component (A) further contains 0.005 to 10 parts by weight of a thermoplastic resin and/or rubber.

Claim 24

Dependent Claim 25 words

The molding as claimed in claim 19, wherein the styrene-based resin composition further contains 0.005 to 10 parts by weight of (C) an inorganic filler.

Claim 25

Dependent Claim 43 words

The molding as claimed in claim 20, wherein the styrene-based resin composition further contains (C) an inorganic filler and a thermoplastic resin and/or rubber and wherein the total amount of inorganic filler, thermoplastic resin and rubber is 0.005 to 10 parts by weight.

Claim 26

Dependent Claim 59 words

A stretched styrene-based resin molding as obtained by subjecting a styrene-based polymer having mainly syndiotactic configuration and a weight average molecular weight of at least 50,000 to uniaxial stretching of at least two times or to biaxial stretching of at least 1.2 times in each direction with a subsequent annealing at a temperature of 120° C. to 250° C.

Claim 27

Dependent Claim 59 words

A stretched styrene-based resin molding as obtained by subjecting a styrene-based polymer having mainly syndiotactic configuration and a weight average molecular weight of at least 50,000 to uniaxial stretching of at least two times or to biaxial stretching of at least 1.2 times in each direction with a subsequent annealing at a temperature of 120° C. to 250° C.

Claim 28

Dependent Claim 22 words

The stretched styrene-based resin molding of claim 23, having heat resistance and such transparency that the haze is not more than 30%.

Claim 29

Dependent Claim 25 words

The stretched styrene-based resin molding of claim 23, having such electric insulating properties that the breakdown voltage at 25° C. is at least 30 kV/mm.

Claim 30

Dependent Claim 42 words

A shaped article of a styrene-based polymer prepared by drawing a styrene-based polymer having a weight-average molecular weight of at least 100,000 and a mainly syndiotactic structure and thereafter annealing the drawn polymer at a temperature of 120° C. to 250° C.

Claim 31

Dependent Claim 42 words

A shaped article of a styrene-based polymer prepared by drawing a styrene-based polymer having a weight-average molecular weight of at least 100,000 and a mainly syndiotactic structure and thereafter annealing the drawn polymer at a temperature of 120° C. to 250° C.

Claim 32

Dependent Claim 36 words

The shaped article of claim 26, wherein the styrene-based polymer has a stereospecificity of syndiotacticity of at least 85% in the racemic pentad as determined by the nuclear magnetic resonance spectrometric analysis with a carbon isotope.

Claim 33

Dependent Claim 14 words

The shaped article of claim 27, wherein the molecular weight is at least 300,000.

Claim 34

Dependent Claim 63 words

A process for producing a stretched styrene-based resin molding which comprises subjecting a styrene-based resin having mainly syndiotactic configuration and a weight average molecular weight of at least 50,000 to uniaxial stretching of at least two times or biaxial stretching of at least 1.2 times in each direction and thereafter, annealing the stretched resin at a temperature of 120° C. to 250° C.

Claim 35

Dependent Claim 63 words

A process for producing a stretched styrene-based resin molding which comprises subjecting a styrene-based resin having mainly syndiotactic configuration and a weight average molecular weight of at least 50,000 to uniaxial stretching of at least two times or biaxial stretching of at least 1.2 times in each direction and thereafter, annealing the stretched resin at a temperature of 120° C. to 250° C.

Claim 36

Dependent Claim 15 words

The process of claim 29, wherein the weight average molecular weight is at least 100,000.

Claim 37

Dependent Claim 26 words

The process of claim 29, wherein the weight average molecular weight is at least 300,000 and the syndiotacticity is at least 85% in the racemic pentad.

Claim 38

Dependent Claim 78 words

A process for producing a stretched styrene-based resin molding which comprises heat melting a styrene-based resin having mainly syndiotactic configuration and a weight average molecular weight of at least 50,000, quenching the molten resin, then subjecting the quenched resin to uniaxial stretching at a draw of at least two times or biaxial stretching at a draw ratio of at least 1.2 times in each direction and thereafter, annealing the stretched resin temperature of 120° C. to 250° C.

Claim 39

Dependent Claim 78 words

A process for producing a stretched styrene-based resin molding which comprises heat melting a styrene-based resin having mainly syndiotactic configuration and a weight average molecular weight of at least 50,000, quenching the molten resin, then subjecting the quenched resin to uniaxial stretching at a draw of at least two times or biaxial stretching at a draw ratio of at least 1.2 times in each direction and thereafter, annealing the stretched resin temperature of 120° C. to 250° C.

Claim 40

Dependent Claim 16 words

The process as claimed in claim 32, wherein quenching rate is from 200 to 3° C./sec.

Claim 41

Dependent Claim 16 words

The process as claimed in claim 32, wherein the draw rate is 3 to 10 times.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1995-11-24	1996-05-25	1996-11-24	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1999-11-24	2000-05-25	2000-11-24	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2003-11-24	2004-05-25	2004-11-24	$7700.00	Window Closed / Lapsed

Styrene-based resin composition

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