US4443585A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diene/acrylate based impact modifier for PVC
Assignee: Rohm and Haas Co
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Filing: 1983-07-12
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Granted: 1984-04-17
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Expires: 2003-07-12
Abstract
Abstract Impact modifiers having high efficiency at low levels and at low temperatures comprising at least three stages, Stage A being a non-crosslinked polymer of at least 70% butadiene and at least 10% lower alkyl (C 2 -C 8 ) acrylate, Stage B being a polymer of at least 80% styrene, and Stage C containing at least 50% methyl methacrylate and at least 1% alkyl (C 1 -C 4 ) acrylate, the ratio of Stages A:B:C, excluding optional additional stages, being about 70-85:10-15:10-20, the ratio of stages C:B being at least 1, and Stage A being non-agglomerated are disclosed. Also disclosed are methods of preparing the impact modifier and thermoplastic polymer compositions containing the impact modifier.
Inventors
- 👤 Theodore D. Goldman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:05
CPC Classifications
C; C08; C08F; C08F285/00; C08L; C08L27/00; C08L27/02; C08L27/04; C08L27/06; C08L51/00; Y; Y10; Y10S; Y10S525/00; Y10S525/902
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
101 words
An impact modifier composition having high efficiency at low levels and at low temperatures comprising a Stage A core polymer and two outer Stage polymers, B and C, said Stage A core polymer being a non-crosslinked, non-agglomerated polymer of at least 70% butadiene and at least 10% alkyl (C 2 -C 8 )acrylate, said Stage B polymer being at least 80% styrene, and said Stage C polymer containing at least 50% methyl methacrylate and at least 1% alkyl (C 1 -C 4 )acrylate, the ratio of Stages A:B:C being about 70-85:10-15:10-20, and the ratio of Stages C:B being at least 1.
Claim 2
Dependent Claim
101 words
An impact modifier composition having high efficiency at low levels and at low temperatures comprising a Stage A core polymer and two outer Stage polymers, B and C, said Stage A core polymer being a non-crosslinked, non-agglomerated polymer of at least 70% butadiene and at least 10% alkyl (C 2 -C 8 )acrylate, said Stage B polymer being at least 80% styrene, and said Stage C polymer containing at least 50% methyl methacrylate and at least 1% alkyl (C 1 -C 4 )acrylate, the ratio of Stages A:B:C being about 70-85:10-15:10-20, and the ratio of Stages C:B being at least 1.
Claim 3
Dependent Claim
23 words
An impact modifier composition according to claim 1 wherein the alkyl (C 1 -C 4 ) acrylate in Stage C is ethyl acrylate.
Claim 4
Dependent Claim
18 words
An impact modifier composition according to claim 1 wherein the alkyl acrylate in Stage A is butyl acrylate.
Claim 5
Dependent Claim
34 words
An impact modifier composition according to claim 1 further comprising additional stages in addition to Stages A, B, and C, and where said additional stages comprise less than about 25% of the impact modifier.
Claim 6
Dependent Claim
18 words
An impact modifier composition according to claim 1 wherein the butadiene:alkyl acrylate ratio in Stage A is 75-95:25-5.
Claim 7
Dependent Claim
57 words
An impact modifier composition according to claim 1 further comprising additional monomers in Stages A, B, or C selected from the group consisting of styrene, lower alkyl acrylates, methacrylates, vinyl esters, acrylonitrile, and crosslinking monomers in Stages B or C selected from the group consisting of divinyl benzene, ethylene glycol dimethacrylate, butylene glycol diacrylate, and allyl methacrylate.
Claim 8
Dependent Claim
35 words
An impact modifier according to claim 1 wherein Stage A is a copolymer of butadiene and butyl acrylate, Stage B is all styrene, and Stage C is a copolymer of methyl methacrylate and ethyl acrylate.
Claim 9
Dependent Claim
80 words
A method of preparing the impact modifier composition of claim 1 comprising feeding the polymerizable monomers of said non-agglomerated, non-crosslinked Stage A core polymer into a reactor to yield a Stage A core polymer of uniform particle size of about 1500 to 2000 Å, and polymerizing said outer Stages B and C in the presence of said previously formed particles of said Stage A core polymer at the surface of the previously formed particles of said Stage A core polymer.
Claim 10
Dependent Claim
21 words
A composition comprising a thermoplastic polymer and about 1 to 25% by weight of said impact modifier composition of claim 1.
Claim 11
Dependent Claim
11 words
The composition of claim 9 wherein said thermoplastic polymer is PVC.
References Cited (Backward Citations)
US4078018A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-04-17 | 1987-10-17 | 1988-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-17 | 1991-10-17 | 1992-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-17 | 1995-10-17 | 1996-04-17 | $7700.00 | Window Closed / Lapsed |