US4214062A — Polycarbonate films of low flammability and impro…

Claim 1

Independent Claim 32 words

Polycarbonate films, characterized in that they contain about 0.01% by weight to 2% by weight of a NH 4 salt, alkali metal salt or alkaline earth metal salt of a perhalogenoalkanesulphonic acid.

Claim 2

Dependent Claim 32 words

Polycarbonate films, characterized in that they contain about 0.01% by weight to 2% by weight of a NH 4 salt, alkali metal salt or alkaline earth metal salt of a perhalogenoalkanesulphonic acid.

Claim 3

Dependent Claim 37 words

Polycarbonate films according to claim 1, characterized in that they contain between about 0.01% by weight and 2% by weight of a NH 4 salt, alkali metal salt or alkaline earth metal salt of a perfluoroalkanesulphonic acid.

Claim 4

Dependent Claim 7 words

Polycarbonate extruded films according to claim 1.

Claim 5

Dependent Claim 67 words

Polycarbonate films according to claim 1, characterized in that they contain NH 4 salts, alkali metal salts or alkaline earth metal salts of perhalogenosulphonic acids of the formula I R--SO.sub.3 --Me (I) wherein R represents C n Hal 2n+1 in which Hal is F or Cl and n is 1 to 8, and wherein Me is NH 4 , an alkali metal or an alkaline earth metal.

Claim 6

Dependent Claim 12 words

Polycarbonate films according to claim 4, characterized in that Me is potassium.

Claim 7

Dependent Claim 35 words

Polycarbonate films according to claim 1, characterized in that the films additionally contain up to about 10% by weight of low-molecular weight, halogen-containing aromatic polycarbonates having average molecular weights Mn of about 4,000 to 20,000.

Claim 8

Dependent Claim 21 words

Polycarbonate films according to claim 6, characterized in that the low-molecular weight, halogen-containing polycarbonate used is one based on tetrabromobisphenol A.

Claim 9

Dependent Claim 44 words

Polycarbonate films according to claim 1, characterized in that the polycarbonates used are high molecular weight, aromatic copolycarbonates of about 99-90 mol % of bisphenol A and about 1-10 mol % of 1,1-bis-(4-hydroxyphenyl)-cyclohexane having average molecular weights M w of about 30,000 to 120,000.

Claim 10

Dependent Claim 36 words

Polycarbonate films according to claim 8, characterized in that the high molecular weight polycarbonates are branched with up to about 0.5 mol %, relative to bisphenol A, of branching components with at least three branching positions.

Claim 11

Dependent Claim 30 words

Polycarbonate films according to claim 1, characterized in that mixtures of high-molecular weight polycarbonates having weight average molecular weights, M w , of from about 25,000 to 80,000 are used.

Claim 12

Dependent Claim 55 words

A polycarbonate film consisting essentially of an aromatic polycarbonate having a weight-average molecular weight, M w , of between about 25,000 and 200,000 and about 0.1 to 2% by weight of a perhalogenoalkanesulphonic acid salt selected from the group consisting of a NH 4 salt, an alkali metal salt and an alkaline earth metal salt.

Claim 13

Dependent Claim 55 words

A polycarbonate film consisting essentially of an aromatic polycarbonate having a weight-average molecular weight, M w , of between about 25,000 and 200,000 and about 0.1 to 2% by weight of a perhalogenoalkanesulphonic acid salt selected from the group consisting of a NH 4 salt, an alkali metal salt and an alkaline earth metal salt.

Claim 14

Dependent Claim 50 words

The polycarbonate film of claim 11 wherein the perhalogenoalkanesulphonic acid salt is of the formula R--SO.sub.3 --Me wherein R represents C n Hal 2n+1 wherein Hal is F or Cl and n is 1 to 8, and Me is NH 4 , an alkali metal or an alkaline earth metal.

Claim 15

Dependent Claim 16 words

The polycarbonate film of claim 12 wherein the perhalogenoalkanesulphonic acid salt is a perfluoroalkanesulphonic acid salt.

Claim 16

Dependent Claim 79 words

A polycarbonate film consisting essentially of an aromatic polycarbonate having a weight-average molecular weight, M w , of between about 25,000 and 200,000, up to about 10% by weight of a low-molecular weight, halogen-containing aromatic polycarbonate having a number-average molecular weight, Mn, of about 4,000 to 20,000 and about 0.1 to 2% by weight of a perhalogenoalkanesulphonic acid salt selected from the group consisting of a NH 4 salt, an alkali metal salt and an alkaline earth metal salt.

Claim 17

Dependent Claim 79 words

A polycarbonate film consisting essentially of an aromatic polycarbonate having a weight-average molecular weight, M w , of between about 25,000 and 200,000, up to about 10% by weight of a low-molecular weight, halogen-containing aromatic polycarbonate having a number-average molecular weight, Mn, of about 4,000 to 20,000 and about 0.1 to 2% by weight of a perhalogenoalkanesulphonic acid salt selected from the group consisting of a NH 4 salt, an alkali metal salt and an alkaline earth metal salt.

Claim 18

Dependent Claim 54 words

A glass fiber-free polycarbonate film comprising an aromatic polycarbonate having a weight-average molecular weight, M w , of between about 25,000 and 200,000 and about 0.1 to 2% by weight of perhalogenoalkanesulphonic acid salt selected from the group consisting of a NH 4 salt, an alkali metal salt and an alkaline earth metal salt.

Claim 19

Dependent Claim 54 words

A glass fiber-free polycarbonate film comprising an aromatic polycarbonate having a weight-average molecular weight, M w , of between about 25,000 and 200,000 and about 0.1 to 2% by weight of perhalogenoalkanesulphonic acid salt selected from the group consisting of a NH 4 salt, an alkali metal salt and an alkaline earth metal salt.

Claim 20

Dependent Claim 49 words

A process for improving the stress crack resistance of a polycarbonate film comprising incorporating from about 0.01 to 2% by weight of perhalogenoalkanesulphonic acid salt selected from the group consisting of an NH 4 salt, an alkali metal salt and an alkaline earth metal salt into said polycarbonate film.

Claim 21

Dependent Claim 49 words

A process for improving the stress crack resistance of a polycarbonate film comprising incorporating from about 0.01 to 2% by weight of perhalogenoalkanesulphonic acid salt selected from the group consisting of an NH 4 salt, an alkali metal salt and an alkaline earth metal salt into said polycarbonate film.

Claim 22

Dependent Claim 50 words

The process of claim 16 wherein the perhalogenoalkanesulphonic acid salt is of the formula R--SO.sub.3 --Me wherein R represents C n Hal 2n+1 wherein Hal is F or Cl, and, n is 1 to 8 and, wherein Me is NH 4 , an alkali metal or an alkaline earth metal.

Claim 23

Dependent Claim 55 words

A polycarbonate film consisting of an aromatic polycarbonate having a weight average molecular weight, M w , of between about 25,000 and 200,000 and about 0.1 to 2% by weight of a perhalogenoalkanesulphonic acid salt selected from the group consisting of an NH 4 salt, an alkali metal salt and an alkaline earth metal salt.

Claim 24

Dependent Claim 55 words

A polycarbonate film consisting of an aromatic polycarbonate having a weight average molecular weight, M w , of between about 25,000 and 200,000 and about 0.1 to 2% by weight of a perhalogenoalkanesulphonic acid salt selected from the group consisting of an NH 4 salt, an alkali metal salt and an alkaline earth metal salt.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1983-07-22	1984-01-21	1984-07-22	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1987-07-22	1988-01-21	1988-07-22	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1991-07-22	1992-01-21	1992-07-22	$7700.00	Window Closed / Lapsed

Polycarbonate films of low flammability and improved stress crack resistance

Abstract

Inventors

Bibliographic Details

Claims Analysis

References Cited (Backward Citations)

USPTO Annuity & Maintenance Windows

Assigned Categories & Tags

Assign Category Tag