Patent US501902A successfully refreshed from Google Patents.
Patent EP0152012A2 successfully refreshed from Google Patents.
EP0152012A2
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EP
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Method for enhancing ionizing radiation resistance of polymer compositions
Assignee: General Electric Co
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Filing: 1985-01-30
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Granted: —
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Expires: 2005-01-30
Abstract
Abstract The normal tendency of aromatic polycarbonate homopolymers and copolymers, alone or in blends with second resins, to undergo yellowing when exposed to ionizing radiation, as in certain sterilizing procedures, is diminished or eliminated by the inclusion of compounds having the effect of increasing the radiation resistance of the polymers. These compounds are, in general, characterized by a strong oxidizing action and/or reaction at high reaction rate with active species such as H radicals, OH radicals and/or hydrated electrons formed by ionizing radiation.
Inventors
- 👤 Roger W. Avakian
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 18:55
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/02; C08K; C08K5/00; C08K5/0008; C08K5/005; C08L69/00; C08L69/005
Claims Analysis
Total Claims: 56
Claim 1
Independent Claim
83 words
A method for imparting enhanced stability against ionizing radiation to an aromatic polycarbonate homopolymer or copolymer,'alone, or in admixture with a second polymer, comprising including an effective amount of at least one non-polymeric stabilizer compound which decreases the tendency of the polymer to undergo yellowing upon exposure to said radiation, said non-polymeric stabilizer compound being characterized by a strong oxidizing action and/or reaction at high reaction rate with active species such as H radicals, OH radicals and/or hydrated electrons formed by ionizing radiation.
Claim 2
Independent Claim
83 words
A method for imparting enhanced stability against ionizing radiation to an aromatic polycarbonate homopolymer or copolymer,'alone, or in admixture with a second polymer, comprising including an effective amount of at least one non-polymeric stabilizer compound which decreases the tendency of the polymer to undergo yellowing upon exposure to said radiation, said non-polymeric stabilizer compound being characterized by a strong oxidizing action and/or reaction at high reaction rate with active species such as H radicals, OH radicals and/or hydrated electrons formed by ionizing radiation.
Claim 3
Dependent Claim
26 words
A method according to Claim 1 wherein said second polymer is present in an amount sufficient to decrease the tendency of the polymer admixture to yellow.
Claim 4
Dependent Claim
54 words
. 3. A method according to Claim 1, in which the stabilizer compound has one or.more functional groups selected from among carboxy (-COOH), ester (-COOR), hydroxy (-OH), thio ( > S), anilido (C 6 H 5 NH-), amino (-NH 2 ), oxamido (H 2 NCOCONH-), carbonyl (> CO), thio-carbonyl ( > CS), and phospho.
Claim 5
Dependent Claim
35 words
A method according to Claim 3, in which the stabilizer compound is selected from among alcohols, esters, hindered phenolic compounds, thioesters, oxamide phenolic compounds, oxalic anilide compounds, thiazoles, thiodiazoles, thiourea, phosphonates, phophonites and diphosphonites. ,
Claim 6
Dependent Claim
39 words
A method according to Claim 1, in which the stabilizer compound is included in an amount from about 0.05 to about 2.0 percent by weight, per 100 parts of the polycarbonate alone or in admixture with the second polymer.
Claim 7
Dependent Claim
42 words
A method according to Claim 1, in which the polycarbonate is a homopolymer prepared by reacting a dihydric phenol with a carbonate precursor and has recurring structural units of the formula wherein A is a divalent aromatic radical of the dihydric phenol.
Claim 8
Dependent Claim
15 words
A method according to Claim 6, in which the polycarbonate is poly(bisphenol A carbonate) resin.
Claim 9
Dependent Claim
58 words
A method according to Claim 1, in which the polycarbonate is a poly(ester-carbonate) comprising recurring carbonate groups: recurring carboxylate groups: and aromatic carbocyclic groups in the linear polymer chain, in which at least some of the carboxylate groups and at least some of the carbonate groups are bonded directly to ring carbon atoms of the aromatic carbocyclic groups.
Claim 10
Dependent Claim
21 words
A method according to Claim 8, in which the poly(ester-carbonate) is derived from bisphenol-A and either isophthalic acid or terephthalic acid.
Claim 11
Dependent Claim
22 words
A method according to Claim 8, in which the poly(ester-carbonate) is derived from a mixture of isophthalic acid, terephthalic acid and bisphenol-A.
Claim 12
Dependent Claim
82 words
A method according to Claim 4, in which the stabilizer compound is a phthalate selected from among diamyl phthalate, dibutyl phthalate, diethyl phthalate, dibenzyl phthalate, dimethyl phthalate, phenyl cresyl phthalate, phenyl benzyl phthalate, butyl benzyl phthalate, butyl cyclohexyl phthalate, octyl cresyl phthalate, diphenyl phthalate, di-n-hexyl phthalate, diisohexyl phthalate, butyl octyl phthalate, butyl decyl phthalate, diisooctyl phthalate, di-2-ethylhexyl phthalate, di-n-octyl phthalate, diisononyl phthalate, diisodecyl phthalate, di-2-propyl.heptyl phthalate, di-n-nonyl phthalate, di-n-decyl phthalate and ditridecyl phthalate, as well as mixtures of any of the foregoing.
Claim 13
Dependent Claim
22 words
A method according to Claim 11, in which the stabilizer compound is an isophthalate or terephthalate corresponding to any of those listed.
Claim 14
Dependent Claim
14 words
A method according to Claim 4, in which the stabilizer compound is an alcohol.
Claim 15
Dependent Claim
13 words
A method according to Claim 13, in which the alcohol is a diol.
Claim 16
Dependent Claim
13 words
A method according to Claim 14, in which the diol is 1,4-cyclohexane dimethanol.
Claim 17
Dependent Claim
13 words
A method according to Claim 13, in which the alcohol is a polyol.
Claim 18
Dependent Claim
12 words
A method according to Claim 16, in which the polyol is pentaerythritol.
Claim 19
Dependent Claim
12 words
A method according to Claim 16, in which the polyol is trimethylolpropane.
Claim 20
Dependent Claim
13 words
A method according to Claim 16, in which the polyol is sterically hindered.
Claim 21
Dependent Claim
20 words
A method according to Claim 19, in which the sterically hindered phenol is 3,5-di-tert-butyl-4-hydroxyhydrocinnamic acid triester with 1,3,5-tris (2-hydroxyethyl)-s- triazine-2,4,6(lH,3H,5H)-trione.
Claim 22
Dependent Claim
17 words
A method according to Claim 19, in which the sterically hindered phenol is tetrakis (methylene (3,5-di-tert-butyl-4-hydroxy-hydrocinnamate)) methane.
Claim 23
Dependent Claim
15 words
A method according to Claim 4, in which the stabilizer compound is an oxamide phenolic.
Claim 24
Dependent Claim
15 words
A method according to Claim 22, in which the oxamide phenolic compound is 2,2'-oxamido-bis-(ethyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate).
Claim 25
Dependent Claim
14 words
A method according to Claim 4, in which the stabilizer compound is a thiadiazole.
Claim 26
Dependent Claim
12 words
A method according to Claim 24, in which the thiadiazole is 2,5-dimercapto-l,3,4-thiadiazole.
Claim 27
Dependent Claim
16 words
A method according to Claim 4, in which the stabilizer compound is an oxalic anilide derivative.
Claim 28
Dependent Claim
14 words
A method according to Claim 4, in which the stabilizer compound is a thioester.
Claim 29
Dependent Claim
12 words
A method according- to Claim 27, in which the thioester is dilaurylthiodipropionate.
Claim 30
Dependent Claim
15 words
A method according to Claim 4, in which the stabilizer compound is a thiazole derivative.
Claim 31
Dependent Claim
13 words
A method according to Claim 29, in which the thiazole derivative is 2-mercaptobenzothiazole.
Claim 32
Dependent Claim
15 words
A method according to Claim 4, in which the stabilizer is an organic phosphorus compound.
Claim 33
Dependent Claim
15 words
A method acccording to Claim 31, in which the organic phosphorus compound is a phosphonate.
Claim 34
Dependent Claim
14 words
A method according to Claim 32, in which the phosphonate is nickel bis(0-ethyl (3,5-di-tert-butyl-4-hydroxybenzyl))phosphonate.
Claim 35
Dependent Claim
15 words
A method according to Claim 31, in which the organic phosphorus compound is a diphosphonite.
Claim 36
Dependent Claim
14 words
A method according to Claim 34, in which the diphosphonite is tetrakis (2,4-di-tert-butylphenyl) 4,4'-biphenylenediphosphonite.
Claim 37
Dependent Claim
16 words
A method according to Claim 1, in which the stabilizer compound is an inorganic acid salt.
Claim 38
Dependent Claim
12 words
A method according to Claim 36, in which the acid is sulfurous.
Claim 39
Dependent Claim
18 words
A method according to Claim 37, in which the salt is an alkali metal salt of sulfurous acid.
Claim 40
Dependent Claim
13 words
A method according to Claim 38, in which the salt is sodium sulfite.
Claim 41
Dependent Claim
17 words
A method according to Claim 1, in which the second polymer is a polyester homopolymer or copolymer.
Claim 42
Dependent Claim
16 words
A method according to Claim 40, in which the second polymer is a poly(alkylene aromatic dicarboxylate).
Claim 43
Dependent Claim
40 words
A method according to Claim 41, in which the poly(alkylene aromatic dicarboxylate) is derived from an aliphatic diol and an aromatic dicarboxylic acid and has repeating units of the formula: wherein n is an integer of from 2 to 4.
Claim 44
Dependent Claim
16 words
A method according to Claim 42, in which the poly(alkylene aromatic dicarboxylate) is poly (ethylene terephthalate).
Claim 45
Dependent Claim
68 words
A method according to Claim 41, in which the poly(alkylene aromatic dicarboxylate) is derived from a cycloaliphatic diol and an aromatic dicarboxylic acid and has recurring units of the formula: wherein the cyclohexane ring is selected from cis- and trans-isomers thereof and R represents an aryl or cycloaliphatic radical containing from 6 to 20 carbon atoms and which is the dicarboxylated residue derived from an aromatic dicarboxylic acid.
Claim 46
Dependent Claim
33 words
A method according to Claim 44, in which the poly(alkylene aromatic dicarboxylate) is derived from the reaction of 1,4-cyclohexanedimethanol with a mixture of isophthalic and terephthalic acids, having repeating units of the formula:
Claim 47
Dependent Claim
86 words
A method according to Claim 41, in which the polyester copolymer is derived from cyclohexanedimethanol, an alkylene glycol and an aromatic dicarboxylic acid having units of the formula in which the cyclohexane ring is selected from the cis-and trans-isomers thereof, R is the dicarboxylated residue of isophthalic or terephthalic acid, n is an integer of from 2 to 10, the x units comprise from about 1 to about 99 percent by weight, and the y units comprise from about 99 to about 1 percent by weight.
Claim 48
Dependent Claim
24 words
A method according to Claim 46, in which the copolyester is derived from the reaction of 1,4-. cyclohexanedimethanol and ethylene glycol with terephthalic acid.
Claim 49
Dependent Claim
23 words
A method according to Claim 1, in which the first polymer is poly(bisphenol A carbonate) homopolymer and the second polymer is poly(ethylene terephthalate).
Claim 50
Dependent Claim
30 words
A method according to Claim 1, in which the first polymer is poly(bisphenol A carbonate) homopolymer and the second polymer is a copolyester of 1,4-cyclohexanedimethanol, ethylene glycol and terephthalic acid.
Claim 51
Dependent Claim
34 words
A method according to Claim 1, in which the first polymer is poly(bisphenol A carbonate) homopolymer and the second polymer is a hydroxy terminated polyester of ethylene glycol, phthalic acid and a branching agent.
Claim 52
Dependent Claim
31 words
A method according to Claim 1, in which the first polymer is poly(bisphenol A carbonate) homopolymer and the second polymer is a polyester of ethylene glycol, butylene glycol and adipic acid.
Claim 53
Dependent Claim
27 words
A method according to Claim 1, in which the first polymer is poly(bisphenol A carbonate) homopolymer and the second is a copolyester of terephthalate, isophthalate and 1,4-cyclohexanedimethanol.
Claim 54
Dependent Claim
29 words
A method according to Claim 1, in which the first polymer is poly(bisphenol A carbonate) homopolymer and the second polymer is a polyester of 1,4-cyclohexanedimethanol and 1,4-cyclohexane dicarboxylic acid.
Claim 55
Dependent Claim
34 words
A method according to Claim 1, in which the first polymer is poly(bisphenol A carbonate) homopolymer and the second polymer is a copolyester comprising units derived from poly(tetramethylene)glycol, 1,4-butanediol, neopentyl glycol and terephthalic acid.
Claim 56
Dependent Claim
31 words
A method according to Claim 2, in which the two polymers range in amount between 99:1 and 1:99 parts by weight, based on 100 parts by weight of the two combined.
References Cited (Backward Citations)
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