US4414267A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for treating discontinuous cellulose fibers characterized by specific polymer to plasticizer and polymer-plasticizer to fiber ratios, fibers thus treated and composites made from the treated fibers
Assignee: Monsanto Co
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Filing: 1981-04-08
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Granted: 1983-11-08
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Expires: 2001-04-08
Abstract
Abstract Discontinuous cellulose fibers are treated to improve their dispersability into a matrix comprising plasticized vinyl chloride polymer. The treatment includes contacting the fibers with a mixture of an aqueous dispersion of a vinyl chloride polymer and a plasticizer so as to coat the fibers, and drying the fibers. The non-aqueous portion of the mixture is usually present in an amount of at least 25 parts per 100 parts of fibers by weight, and the weight ratio of plasticizer to vinyl chloride polymer in the mixture is from 2:1 to 25:1. The discontinuous fibers thus treated can be dispersed into a matrix comprising plasticized vinyl chloride polymer with a minimum of mixing, and the improved composites thus produced contain a minimum of clumps of undispersed fibers.
Inventors
- 👤 Aubert Y. Coran
- 👤 Lloyd A. Goettler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:22
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/04; C08J5/06; D; D06; D06M; D06M15/00; D06M15/19; D06M15/21; D06M15/244; C08J2327/00; C08J2327/02; C08J2327/04; C08J2327/06; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/253; Y10T428/29; Y10T428/2904; Y10T428/2907
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
103 words
The process of treating discontinuous cellulose fibers by slurrying said fibers in water, contacting said fibers with a mixture of (a) an aqueous suspension of a vinyl chloride polymer in which suspension the polymer has a particle diameter of 10μm or less and (b) a plasticizer for said polymer, causing the polymer and plasticizer to deposit on the fibers, and drying the treated fibers, wherein the polymer and plasticizer together are present in an amount of at least 25 parts per 100 parts of fiber by weight, and the weight ratio of plasticizer to polymer in the mixture is from 2.5:1 to 25:1.
Claim 2
Dependent Claim
103 words
The process of treating discontinuous cellulose fibers by slurrying said fibers in water, contacting said fibers with a mixture of (a) an aqueous suspension of a vinyl chloride polymer in which suspension the polymer has a particle diameter of 10μm or less and (b) a plasticizer for said polymer, causing the polymer and plasticizer to deposit on the fibers, and drying the treated fibers, wherein the polymer and plasticizer together are present in an amount of at least 25 parts per 100 parts of fiber by weight, and the weight ratio of plasticizer to polymer in the mixture is from 2.5:1 to 25:1.
Claim 3
Dependent Claim
58 words
The process of claim 1, wherein the polymer and plasticizer together are present in an amount of at least 30 parts per 100 parts of fibers by weight, the weight ratio of plasticizer to polymer in the mixture is from 2.5:1 to 15:1, and the polymer in aqueous suspension has a particle diameter of 5 μm or less.
Claim 4
Dependent Claim
45 words
The process of claim 1, wherein the non-aqueous portion of the mixture is present in an amount of at least 40 parts per 100 parts of fibers by weight, and the weight ratio of plasticizer to polymer in the mixture is from 2.8:1 to 10:1.
Claim 5
Dependent Claim
15 words
The process of claim 1, wherein the aqueous suspension of the polymer is a latex.
Claim 6
Dependent Claim
19 words
The process of claim 1, wherein a coagulent is added to cause the mixture to deposit on the fibers.
Claim 7
Dependent Claim
12 words
The process of claim 1, wherein the mixture also contains a filler.
Claim 8
Dependent Claim
13 words
The process of claim 1, wherein the mixture also contains a bonding agent.
Claim 9
Dependent Claim
19 words
The process of claim 1 wherein the aspect ratio of the cellulose fiber is within the range of 50-350.
Claim 10
Dependent Claim
19 words
The process of claim 2, wherein the aspect ratio of the cellulose fiber is within the range of 75-200.
Claim 11
Dependent Claim
12 words
The process of claim 9 wherein the cellulose fiber is hardwood kraft.
Claim 12
Dependent Claim
9 words
Treated fibers produced by the process of claim 9.
Claim 13
Dependent Claim
17 words
A composite containing treated fibers of claim 11 dispersed in a matrix which comprises vinyl chloride polymer.
Claim 14
Dependent Claim
9 words
Treated fibers produced by the process of claim 1.
Claim 15
Dependent Claim
17 words
A composite containing treated fibers of claim 13 dispersed in a matrix which comprises vinyl chloride polymer.
Claim 16
Dependent Claim
30 words
The composite of claim 14, wherein the fibers are present in an amount of from 1 to 40 weight percent of cellulose based on the total weight of the composite.
References Cited (Backward Citations)
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US3836412A
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US4263184A
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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) | 1986-11-07 | 1987-05-09 | 1987-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-07 | 1991-05-09 | 1991-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-07 | 1995-05-09 | 1995-11-08 | $7700.00 | Window Closed / Lapsed |