US4443568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization process and product
Assignee: Akzo Nobel Paints LLC
•
Filing: 1981-10-26
•
Granted: 1984-04-17
•
Expires: 2001-10-26
Abstract
Abstract The product and process is directed to polymerizing second stage ethylenically unsaturated monomers within an aqueous dispersion of a preformed epoxy based resinous material comprising a mixture of graft epoxy polymer containing grafted addition polymer grafted to the epoxy backbone, ungrafted epoxy polymer, and ungrafted addition polymer uniformly dispersed in water wherein the second stage monomers are polymerized in the presence of at least 0.1% of benzoin derivative reducing agent based on monomer weight in combination with a peroxide polymerization initiator.
Inventors
- 👤 James T. K. Woo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:46
CPC Classifications
C; C08; C08F; C08F283/00; C08F283/10; C08F285/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
202 words
In a process for polymerizing ethylenically unsaturated monomers in the presence of an aqueous dispersed resinous reaction product produced in a first stage addition polymerization of ethylenically unsaturated monomer in the presence of an epoxy resin and in the presence of at least 3% by weight benzoyl peroxide based on monomer, wherein the resinous reaction product comprises epoxy resin, addition polymer of polymerized monomers, and grafted polymer of addition polymer grafted to the epoxy resin wherein the resinous reaction product contains between 30% to 90% by weight of said epoxy resin and is dispersed in water, the improvement comprising: polymerizing second stage ethylenically unsaturated monomers in the presence of said resinous reaction product on a weight basis of between 1 to 5 weight parts of second stage monomer per 20 weight parts of first stage resinous reaction product, wherein said second stage monomers are polymerized in the presence of peroxide catalyst in combination with about 0.1% and 10% of a benzoin derivative reducing agent based on the weight of second stage monomer polymerized to produce a resulting product containing between about 1 to 5 weight parts of second stage polymerized monomer per about 20 weight parts of first stage resinous reaction product.
Claim 2
Dependent Claim
202 words
In a process for polymerizing ethylenically unsaturated monomers in the presence of an aqueous dispersed resinous reaction product produced in a first stage addition polymerization of ethylenically unsaturated monomer in the presence of an epoxy resin and in the presence of at least 3% by weight benzoyl peroxide based on monomer, wherein the resinous reaction product comprises epoxy resin, addition polymer of polymerized monomers, and grafted polymer of addition polymer grafted to the epoxy resin wherein the resinous reaction product contains between 30% to 90% by weight of said epoxy resin and is dispersed in water, the improvement comprising: polymerizing second stage ethylenically unsaturated monomers in the presence of said resinous reaction product on a weight basis of between 1 to 5 weight parts of second stage monomer per 20 weight parts of first stage resinous reaction product, wherein said second stage monomers are polymerized in the presence of peroxide catalyst in combination with about 0.1% and 10% of a benzoin derivative reducing agent based on the weight of second stage monomer polymerized to produce a resulting product containing between about 1 to 5 weight parts of second stage polymerized monomer per about 20 weight parts of first stage resinous reaction product.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein the benzoin derivative is benzoin.
Claim 4
Dependent Claim
20 words
The process in claim 1 wherein about 10 moles of peroxide are used per mole of benzoin derivative reducing agent.
Claim 5
Dependent Claim
11 words
The process in claim 1 wherein the peroxide is a hydroperoxide.
Claim 6
Dependent Claim
25 words
The process in claim 1 wherein the aqueous dispersoid comprises an epoxy polymer, an addition polymer, and an epoxy graft polymer containing grafted addition polymer.
Claim 7
Dependent Claim
11 words
The process in claim 5 wherein the benzoin derivative is benzoin.
Claim 8
Dependent Claim
20 words
The process in claim 6 wherein about 4 to 6 moles of peroxide are used per mole of benzoin derivative.
Claim 9
Dependent Claim
11 words
The process in claim 7 wherein the peroxide is a hydroperoxide.
Claim 10
Dependent Claim
9 words
The product produced by the process in claim 1.
Claim 11
Dependent Claim
9 words
The product produced by the process in claim 5.
References Cited (Backward Citations)
US3403088A
Cited
US3969300A
Cited
US3709866A
Cited
US4014771A
Cited
US4190693A
Cited
US4212781A
Cited
US4285847A
Cited
US4294741A
Cited
US4297261A
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 |