Patent EP0111365A2 successfully refreshed from Google Patents.
EP0365986A2
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Method for the preparation of graft polymer dispersions having broad particle size distribution without wildly fluctuating viscosities
Assignee: BASF Corp
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Filing: 1989-10-18
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Granted: —
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Expires: 2009-10-18
Abstract
Abstract A method for preparing graft polymer dispersions having broad particle size distribution without wildly fluctuating viscosities is disclosed. The method comprises: (a) preparing intermediate graft polyol dispersions containing 30 percent by weight or less solids to achieve a broad distribution of partial sizes in a continuous process by feeding a sufficient amount of an ethylenically unsaturated monomer and a free radical initiator into a flow reactor at a temperature sufficient to promote polymerization, and (b) charging the intermediate graft polymer dispersion of (a) to a semi-batch reactor as seeds for further grafting to increase the solids content of the dispersion to above 30 percent by weight by feeding an effective amount of an ethylenically unsaturated monomer and a free radical initiator into the semi-batch reactor at a temperature sufficient to promote the growth of the seeds, whereby the seed particles generally grow larger but retain the characteristic of broad size distribution. The graft polymer so formed is useful in the production of polyurethanes.
Inventors
- 👤 Mao Yao Huang
- 👤 Kenneth Charles Scott
- 👤 Joseph Francis Louvar
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 15:58
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/63; C08G18/632; C08F; C08F291/00; C08F291/06; C08F291/08; C08G18/635
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
147 words
A method for preparing graft polymer dispersions having broad particle size distribution without wildly fluctuating viscosities, comprising: (a) preparing intermediate graft polyol dispersions containing 30 percent by weight or less solids to achieve a broad distribution of particle sizes in a continuous process by feeding a subsequent effective amount of an ethylenically unsaturated monomer and a free radical initiator into a flow reactor at a temperature sufficient to promote polymerization; and (b) charging the intermediate graft polymer dispersion of (a) to a semi-batch reactor as seeds for further grafting to increase the solids content of the dispersion to above 30 percent by weight by feeding an effective amount of an ethylenically unsaturated monomer and a free radical initiator into the semi-batch reactor at a temperature sufficient to promote growth of the seeds whereby the seed particles generally grow larger but retain the characteristic of broad size distribution.
Claim 2
Independent Claim
147 words
A method for preparing graft polymer dispersions having broad particle size distribution without wildly fluctuating viscosities, comprising: (a) preparing intermediate graft polyol dispersions containing 30 percent by weight or less solids to achieve a broad distribution of particle sizes in a continuous process by feeding a subsequent effective amount of an ethylenically unsaturated monomer and a free radical initiator into a flow reactor at a temperature sufficient to promote polymerization; and (b) charging the intermediate graft polymer dispersion of (a) to a semi-batch reactor as seeds for further grafting to increase the solids content of the dispersion to above 30 percent by weight by feeding an effective amount of an ethylenically unsaturated monomer and a free radical initiator into the semi-batch reactor at a temperature sufficient to promote growth of the seeds whereby the seed particles generally grow larger but retain the characteristic of broad size distribution.
Claim 3
Dependent Claim
17 words
The method of claim 1, wherein the temperature of step (a) is from about 80° to 150°C.
Claim 4
Dependent Claim
17 words
The method of claim 1, wherein the temperature of step (b) is from about 80° to 150°C.
Claim 5
Dependent Claim
27 words
The method of claim 1, wherein the ethylenically unsaturated monomers are selected from the group consisting of acrylonitrile, styrene, vinylidene chloride, methyl methacrylate, acrylamide and mixtures thereof.
Claim 6
Dependent Claim
17 words
The method of claim 1, wherein the ethylenically unsaturated monomer is a mixture of acrylonitrile and styrene.
Claim 7
Dependent Claim
87 words
A graft polymer dispersion prepared by the polymerization in the presence of an effective amount of a free radical initiator, an ethylenically unsaturated monomer in an amount of about 10 to 30 parts of monomer per 100 parts of dispersion product to form a first seed polymer, followed by the polymerization in the presence of a free radical initator, an ethylenically unsaturated monomer in an amount of about 30 to 60 parts of monomer per 100 parts of dispersion product in the presence of the seed polymer.
Claim 8
Dependent Claim
87 words
A graft polymer dispersion prepared by the polymerization in the presence of an effective amount of a free radical initiator, an ethylenically unsaturated monomer in an amount of about 10 to 30 parts of monomer per 100 parts of dispersion product to form a first seed polymer, followed by the polymerization in the presence of a free radical initator, an ethylenically unsaturated monomer in an amount of about 30 to 60 parts of monomer per 100 parts of dispersion product in the presence of the seed polymer.
Claim 9
Dependent Claim
21 words
The graft polymer dispersion of claim 8. wherein the polymerization is conducted at a temperature of between about 80°C and 150°C.
Claim 10
Dependent Claim
100 words
A polyurethane prepared by the reaction of an organic polyisocyanate with a graft polymer dispersion prepared by polymerization, in the presence of an effective amount of a free radical initiator, of an ethylenically unsaturated monomer in the amount of from 10 to 30 parts of monomer per 100 parts of the dispersion product to form a first seed polymer followed by the polymerization, in the presence of a free radical initiator, of an ethylenically unsaturated monomer in an amount of about 30 to 60 parts of monomer per 100 parts of dispersion product in the presence of the seed polymer.
Claim 11
Dependent Claim
100 words
A polyurethane prepared by the reaction of an organic polyisocyanate with a graft polymer dispersion prepared by polymerization, in the presence of an effective amount of a free radical initiator, of an ethylenically unsaturated monomer in the amount of from 10 to 30 parts of monomer per 100 parts of the dispersion product to form a first seed polymer followed by the polymerization, in the presence of a free radical initiator, of an ethylenically unsaturated monomer in an amount of about 30 to 60 parts of monomer per 100 parts of dispersion product in the presence of the seed polymer.
Claim 12
Dependent Claim
9 words
The polyurethane of claim 8, further including blowing agents.
Claim 13
Dependent Claim
9 words
The polyurethane of claim 8, further including flame retardants.
References Cited (Backward Citations)
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