US4845137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyolefin compositions of high clarity and resistance to oxidation
Assignee: Becton Dickinson and Co
•
Filing: 1987-11-05
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Granted: 1989-07-04
•
Expires: 2007-11-05
Abstract
Abstract Polyolefin compositions having high clarity and resistance to oxidative degradation are obtained with new dibenzylidene sorbitol additives having a sulfur-containing substituent on at least one of the benzylidene rings. Preferred additives are thioethers.
Inventors
- 👤 Joel L. Williams
- 👤 George R. Titus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:29
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/15; C08K5/36; C08K5/37; C08K5/378
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
76 words
An antioxidizing and clarifying additive for a polyolefin comprising a dibenzylidene sorbitol thioether selected from the group consisting of compounds of the structure ##STR2## wherein R may be hydrogen, halogen, lower alkoxy, lower alkyl, lower alkylthio, lower alkylsulfoxy or phenylthio wherein the term lower with respect to alkyl or alkoxy is intended to be from 1 to 6 carbon atoms, branched or unbranched, and at least one of the substituent groups is a sulfur containing group.
Claim 2
Dependent Claim
76 words
An antioxidizing and clarifying additive for a polyolefin comprising a dibenzylidene sorbitol thioether selected from the group consisting of compounds of the structure ##STR2## wherein R may be hydrogen, halogen, lower alkoxy, lower alkyl, lower alkylthio, lower alkylsulfoxy or phenylthio wherein the term lower with respect to alkyl or alkoxy is intended to be from 1 to 6 carbon atoms, branched or unbranched, and at least one of the substituent groups is a sulfur containing group.
Claim 3
Dependent Claim
24 words
The additive of claim 1 which is an alkyl thioether having from 1 to 6 carbon atoms in the alkyl portion of said thioether.
Claim 4
Dependent Claim
10 words
The additive of claim 1 which is a phenyl thioether.
Claim 5
Dependent Claim
9 words
The additive of claim 1 which is a monothioether.
Claim 6
Dependent Claim
18 words
The additive of claim 1 which is a dithioether wherein one thioether group is in each benzylidene ring.
Claim 7
Dependent Claim
12 words
The additive of claim 1 wherein said thioether is a dibenzylidene sorbitol-4-thioether.
Claim 8
Dependent Claim
12 words
The additive of claim 1 wherein said thioether is a dibenzylidene sorbitol-3-thioether.
Claim 9
Dependent Claim
9 words
An antioxidizing and clarifying additive which is dibenzylidene sorbitol-4,4'-bis(methylsulfoxide).
Claim 10
Dependent Claim
9 words
An antioxidizing and clarifying additive which is dibenzylidene sorbitol-4,4'-bis(methylsulfoxide).
Claim 11
Dependent Claim
11 words
An antioxidizing and clarifying additive for a polyolefin comprising 4,4'-bis(methylthio)dibenzylidene sorbitol.
Claim 12
Dependent Claim
11 words
An antioxidizing and clarifying additive for a polyolefin comprising 4,4'-bis(methylthio)dibenzylidene sorbitol.
Claim 13
Dependent Claim
80 words
A composition comprising a polyolefin and a clarifying and antioxidizing amount of a dibenzylidene sorbitol thioether selected from the group consisting of compounds of the general structure ##STR3## wherein R may be hydrogen, halogen, lower alkoxy, lower alkyl, lower alkylthio, lower alkylsulfoxy or phenylthio wherein the term lower with respect to alkyl or alkoxy is intended to be from 1 to 6 carbon atoms, branched or unbranched, and at least one of the substituent groups is a sulfur containing group.
Claim 14
Dependent Claim
80 words
A composition comprising a polyolefin and a clarifying and antioxidizing amount of a dibenzylidene sorbitol thioether selected from the group consisting of compounds of the general structure ##STR3## wherein R may be hydrogen, halogen, lower alkoxy, lower alkyl, lower alkylthio, lower alkylsulfoxy or phenylthio wherein the term lower with respect to alkyl or alkoxy is intended to be from 1 to 6 carbon atoms, branched or unbranched, and at least one of the substituent groups is a sulfur containing group.
Claim 15
Dependent Claim
20 words
The composition of claim 10 wherein said polyolefin is selected from the group consisting of polyethylene, polypropylene, polymethylpentene and polytetrafluoroethylene.
Claim 16
Dependent Claim
23 words
The composition of claim 10 wherein said thioether is an alkyl thioether having from 1 to 6 carbon atoms in the alkyl portion.
Claim 17
Dependent Claim
12 words
The composition of claim 10 wherein said thioether is a phenyl thioether.
Claim 18
Dependent Claim
11 words
The composition of claim 10 wherein said thioether is a monothioether.
Claim 19
Dependent Claim
19 words
The composition of claim 10 wherein said thioether is a dithioether having one thioether group in each benzylidene ring.
Claim 20
Dependent Claim
12 words
The composition of claim 10 wherein said thioether is a dibenzylidene sorbitol-4-thioether.
Claim 21
Dependent Claim
12 words
The composition of claim 10 wherein said thioether is a dibenzylidene sorbitol-3-thioether.
Claim 22
Dependent Claim
13 words
A composition comprising polypropylene and an antioxidizing and clarifying amount of dibenzylidene sorbitol-4,4'-bis(methysulfoxide).
Claim 23
Dependent Claim
13 words
A composition comprising polypropylene and an antioxidizing and clarifying amount of dibenzylidene sorbitol-4,4'-bis(methysulfoxide).
Claim 24
Dependent Claim
14 words
A composition comprising polypropylene and a clarifying and antioxidizing amount of 4,4'-bis(methylthio) dibenzylidene sorbitol.
Claim 25
Dependent Claim
14 words
A composition comprising polypropylene and a clarifying and antioxidizing amount of 4,4'-bis(methylthio) dibenzylidene sorbitol.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-03 | 1993-01-02 | 1993-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-03 | 1997-01-02 | 1997-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-03 | 2001-01-02 | 2001-07-04 | $7700.00 | Window Closed / Lapsed |