Patent US4460445A successfully refreshed from Google Patents.
US4460445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiation-stable polyolefin compositions containing benzaldehyde acetals
Assignee: MILLIKEN RESEARCH Corp SPARTANBURG SOUTH CAROLINA A CORP OF SOUTH CAROLINA
•
Filing: 1983-02-28
•
Granted: 1984-07-17
•
Expires: 2003-02-28
Abstract
Abstract An olefinic polymer composition is provided which comprises an olefinic polymer selected from homopolymers and copolymers made from aliphatic, ethylenically unsaturated monomers containing from 2 to about 10 carbon atoms; from about 100 to about 3,000 parts per million based on the weight of the total composition of a hindered phenolic stabilizer; and from about 100 to about 10,000 ppm based on the weight of the composition of a stabilizer selected from compounds of the formula: ##STR1## wherein R 1 and R 2 are each independently selected from an alkyl group containing from 1 to about 20 carbon atoms or alternatively R 1 and R 2 may together with the oxygen atoms to which they are joined form a heterocyclic ring containing two oxygen atoms.
Inventors
- 👤 John W. Rekers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:45
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/06; C08K5/13; C08K5/15; C08K5/156; C08K5/1575
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
149 words
An olefinic polymer composition resistant to discoloration or degradation in physical properties when subjected to sterilizing amounts of radiation which comprises: (a) an olefinic polymer selected from homopolymers and copolymers made from at least one, aliphatic, ethylenically unsaturated monomer containing from two to about ten carbon atoms: (b) from about 100 to about 3,000 parts per million based on the weight of the total composition of a hindered phenolic stabilizer; and (c) from about 100 to about 10,000 parts per million based on the weight of the total composition of a stabilizer selected from benzaldehyde acetal compounds of the formula: ##STR11## wherein R 1 and R 2 are each independently selected from an alkyl group containing from 1 to about 20 carbon atoms or alternatively R 1 and R 2 may together with the oxygen atoms to which they are joined form a heterocyclic ring containing two oxygen atoms.
Claim 2
Dependent Claim
149 words
An olefinic polymer composition resistant to discoloration or degradation in physical properties when subjected to sterilizing amounts of radiation which comprises: (a) an olefinic polymer selected from homopolymers and copolymers made from at least one, aliphatic, ethylenically unsaturated monomer containing from two to about ten carbon atoms: (b) from about 100 to about 3,000 parts per million based on the weight of the total composition of a hindered phenolic stabilizer; and (c) from about 100 to about 10,000 parts per million based on the weight of the total composition of a stabilizer selected from benzaldehyde acetal compounds of the formula: ##STR11## wherein R 1 and R 2 are each independently selected from an alkyl group containing from 1 to about 20 carbon atoms or alternatively R 1 and R 2 may together with the oxygen atoms to which they are joined form a heterocyclic ring containing two oxygen atoms.
Claim 3
Dependent Claim
30 words
The olefinic polymer composition of claim 1 wherein said benzaldehyde acetal compounds are selected from benzaldehyde dioctadecyl acetal, benzaldehyde dioctyl acetal, benzaldehyde di-2-octyl acetal, benzaldehyde dimethyl acetal and dibenzylidene sorbitol.
Claim 4
Dependent Claim
35 words
The olefinic polymer composition of claim 1 wherein said olefinic polymer is selected from homopolymers of polypropylene and random or block copolymers of polypropylene with other mono-α-olefins containing from one to about 10 carbon atoms.
Claim 5
Dependent Claim
105 words
An additive package for improving the resistance of an olefinic polymer composition to discoloration or degradation in physical properties when subjected to sterilizing amounts of radiation, which comprises: (a) 100 parts of a hindered phenolic stabilizer; and (b) from about 20 to about 2000 parts of a stabilizer selected from benzaldehyde acetal compounds of the formula: ##STR12## wherein R 1 and R 2 are each independently selected from an alkyl group containing from 1 to about 20 carbon atoms or alternatively R 1 and R 2 may together with the oxygen atoms to which they are joined form a heterocyclic ring containing two oxygen atoms.
Claim 6
Dependent Claim
105 words
An additive package for improving the resistance of an olefinic polymer composition to discoloration or degradation in physical properties when subjected to sterilizing amounts of radiation, which comprises: (a) 100 parts of a hindered phenolic stabilizer; and (b) from about 20 to about 2000 parts of a stabilizer selected from benzaldehyde acetal compounds of the formula: ##STR12## wherein R 1 and R 2 are each independently selected from an alkyl group containing from 1 to about 20 carbon atoms or alternatively R 1 and R 2 may together with the oxygen atoms to which they are joined form a heterocyclic ring containing two oxygen atoms.
Claim 7
Dependent Claim
29 words
The additive package of claim 4 wherein said benzaldehyde acetal compounds are selected from benzaldehyde dioctadecyl acetal, benzaldehyde dioctyl acetal, benzaldehyde di-2-octyl acetal, benzaldehyde dimethyl acetal and dibenzylidene sorbitol.
Claim 8
Independent Claim
137 words
A method for sterilizing a shaped article made from an olefinic polymer composition which comprises subjecting said shaped article to high energy radiation in an amount sufficient to sterilize said shaped article; said olefinic polymer composition comprising an olefinic polymer selected from homopolymers and copolymers made from aliphatic, ethylenically unsaturated monomers containing from 2 to about 10 carbon atoms and from about 100 to about 10,000 parts per million based upon the weight of the total composition of a stabilizer selected from benzaldehyde acetal compounds of the formula: ##STR13## wherein R 1 and R 2 are each independently selected from an alkyl group containing from 1 to about 20 carbon atoms or alternatively R 1 and R 2 may together with the oxygen atoms to which they are joined form a heterocyclic ring containing two oxygen atoms.
Claim 9
Independent Claim
137 words
A method for sterilizing a shaped article made from an olefinic polymer composition which comprises subjecting said shaped article to high energy radiation in an amount sufficient to sterilize said shaped article; said olefinic polymer composition comprising an olefinic polymer selected from homopolymers and copolymers made from aliphatic, ethylenically unsaturated monomers containing from 2 to about 10 carbon atoms and from about 100 to about 10,000 parts per million based upon the weight of the total composition of a stabilizer selected from benzaldehyde acetal compounds of the formula: ##STR13## wherein R 1 and R 2 are each independently selected from an alkyl group containing from 1 to about 20 carbon atoms or alternatively R 1 and R 2 may together with the oxygen atoms to which they are joined form a heterocyclic ring containing two oxygen atoms.
Claim 10
Dependent Claim
14 words
The process according to claim 6 wherein said high energy radiation is gamma radiation.
References Cited (Backward Citations)
US2922776A
Cited
US2802804A
Cited
US3537967A
Cited
US3843402A
Cited
US4101720A
Cited
JPS4916107A
Cited
US3940325A
Cited
US4016118A
Cited
US4016118B1
Cited
JPS5358547A
Cited
JPS53117044A
Cited
JPS53132049A
Cited
US4294747A
Cited
JPS56149451A
Cited
US4371645A
Cited
US4388119A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-17 | 1988-01-16 | 1988-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-17 | 1992-01-16 | 1992-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-17 | 1996-01-16 | 1996-07-17 | $7700.00 | Window Closed / Lapsed |