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EP0096447A2
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Rubber reinforced polymers of monovinylidene aromatic compounds and a method for their preparation
Assignee: Dow Chemical Co
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Filing: 1983-06-02
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Granted: —
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Expires: 2003-06-02
Abstract
Abstract A rubber-reinforced polymer of a monovinylidene aromatic compound, e.g.. styrene, having rubber of two different particle sizes distributed through the polymer matrix and exhibiting a desirable balance of gloss and toughness properties is continuously prepared using mass poiymeriza- ` - tion techniques. Specifically, the rubber-reinforced polymer is prepared by polymerizing a solution of the rubber and monovinylidene aromatic compound in the presence of a graft promoting initiator, e.g., dibenzoyl peroxide, and at conditions sufficient to form a dispersion comprising a continuous phase of polymer having discrete, rubber particles of a particle size from 0.5 to 1.5 micron dispersed therethrough. Subsequently, additional amounts of rubber are added to the polymerization mixture and polymerization continued at conditions such that the newly added rubber is dispersed throughout the continuous polymer phase as discrete particles having a particle size from 4 to 10 microns. The polymerization is completed and the rubber subsequently crosslinked.
Inventors
- 👤 Julien Helene Joseph Marie Damen
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 12:36
CPC Classifications
C; C08; C08F; C08F279/00; C08F279/02; C08F291/00; C08F291/02
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
107 words
A rubber-reinforced polymer comprising a polymer derived from one or more polymerizable monovinylidene aromatic compounds having discrete, grafted rubber particles dispersed throughout the polymer, wherein from 70 to 95 weight percent of the total amount of rubber is present in particles having a volume average diameter from 0.5 to 1.5 micrometer and from 5 to 30 weight percent of the total weight of rubber is present in particles having a volume average diameter from 4 to 10 micrometer and the total amount of polymer grafted to the rubber of the smaller size rubber particles is at least 1.3 times the weight of rubber in said smaller particles.
Claim 2
Dependent Claim
107 words
A rubber-reinforced polymer comprising a polymer derived from one or more polymerizable monovinylidene aromatic compounds having discrete, grafted rubber particles dispersed throughout the polymer, wherein from 70 to 95 weight percent of the total amount of rubber is present in particles having a volume average diameter from 0.5 to 1.5 micrometer and from 5 to 30 weight percent of the total weight of rubber is present in particles having a volume average diameter from 4 to 10 micrometer and the total amount of polymer grafted to the rubber of the smaller size rubber particles is at least 1.3 times the weight of rubber in said smaller particles.
Claim 3
Dependent Claim
23 words
The rubber-reinforced polymer of Claim 1 wherein the rubber is a homo- or copolymer of 1,3-butadiene and the monovinylidene aromatic compound is styrene.
Claim 4
Dependent Claim
65 words
The rubber-reinforced polymer of Claim 2 wherein the particle sizes of the rubber, the amount of each particle size and the polymer graft are such that the rubber-reinforced polymer exhibits an elongation of at least 18 percent, a gloss of at least 70 percent and an impact strength, expressed as joules/meter, of at least 10 times the percent of polymerized butadiene in the rubber-reinforced polymer.
Claim 5
Dependent Claim
65 words
The rubber-reinforced polymer of Claim 2 wherein the particle sizes of the rubber, the amount of each particle size and the polymer graft are such that the rubber-reinforced polymer exhibits an elongation of at least 25 percent, a gloss of at least 80 percent and an impact strength, expressed as joules/meter, of at least 12 times the percent of polymerized butadiene in the rubber-reinforced polymer.
Claim 6
Dependent Claim
65 words
The rubber-reinforced polymer of Claim 2 wherein the particle sizes of the rubber, the amount of each particle size and the polymer graft are such that the rubber-reinforced polymer exhibits an elongation of at least 25 percent, a gloss of at least 60 percent and an impact strength, expressed as joules/meter, of at least 16 times the percent of polymerized butadiene in the rubber-reinforced polymer.
Claim 7
Dependent Claim
65 words
The rubber-reinforced polymer of Claim 2 wherein the particle sizes of the rubber, the amount of each particle size and the polymer graft are such that the rubber-reinforced polymer exhibits an elongation of at least 25 percent, a gloss of at least 90 percent and an impact strength, expressed as joules/meter, of at least 10 times the percent of polymerized butadiene in the rubber-reinforced polymer.
Claim 8
Dependent Claim
93 words
The rubber-reinforced polymer of Claim 2 wherein the rubber-reinforced polymer comprises from 5 to 10 weight percent rubber based on the total weight of the rubber-reinforced polymer, the volume average diameter of from 80 to 90 weight percent of said rubber is from 0.6 to 1.2 micrometer, the volume average diameter of from 10 to 20 weight percent of said rubber is from 4 to 8 micrometer and the rubber-reinforced polymer further comprises from 1 to 7 weight percent mineral oil, said weight percent being based on the weight of the rubber-reinforced polymer.
Claim 9
Dependent Claim
192 words
A rubber-reinforced polymer comprising a polymer derived from one or more polymerizable monovinylidene aromatic compounds having discrete, grafted rubber particles of a homopolymer or copolymer of 1,3-butadiene dispersed throughout the polymer, wherein from 70.to 95 weight percent of the total amount of rubber is present in particles having a volume average diameter of from 0.5 to 1.5 micrometers and 5 to 30 weight percent of the total weight of rubber is present in particles having a volume average diameter of from 4 to 10 micrometers and the total amount of polymer grafted to the total rubber of both the small and large size rubber particles -is at least 1.3 times the weight of the rubber in said particles and is distributed between the rubber of the large and small particles such that the gloss of the rubber-reinforced polymer is at least 70 percent, the elongation is at least 18 percent, the Izod impact, measured in joules per meter (J/m), is at least 10 times the percent of butadiene in the rubber and the melt flow index is 3 to 12 g/10 min. as determined by the method of ASTM D-1238, Condition G.
Claim 10
Dependent Claim
192 words
A rubber-reinforced polymer comprising a polymer derived from one or more polymerizable monovinylidene aromatic compounds having discrete, grafted rubber particles of a homopolymer or copolymer of 1,3-butadiene dispersed throughout the polymer, wherein from 70.to 95 weight percent of the total amount of rubber is present in particles having a volume average diameter of from 0.5 to 1.5 micrometers and 5 to 30 weight percent of the total weight of rubber is present in particles having a volume average diameter of from 4 to 10 micrometers and the total amount of polymer grafted to the total rubber of both the small and large size rubber particles -is at least 1.3 times the weight of the rubber in said particles and is distributed between the rubber of the large and small particles such that the gloss of the rubber-reinforced polymer is at least 70 percent, the elongation is at least 18 percent, the Izod impact, measured in joules per meter (J/m), is at least 10 times the percent of butadiene in the rubber and the melt flow index is 3 to 12 g/10 min. as determined by the method of ASTM D-1238, Condition G.
Claim 11
Independent Claim
179 words
A method for preparing a rubber-reinforced polymer of one or more monovinylidene aromatic compounds having rubber of two different particle sizes dispersed through the aromatic polymer matrix, the method comprising the steps of mass polymerizing a first mixture comprising a solution of one or more polymerizable monovinylidene aromatic compounds and a rubber in the presence of an initiator which promotes polymer grafting to the rubber and at conditions sufficient to form a continuous phase containing polymer of monovinylidene aromatic compound and discrete particles of highly grafted rubber particles having a volume average diameter from 0.5 to 1.5 micrometer; subsequently admixing a second rubber--containing mixture, which rubber can be the same as or different from the rubber of the first mixture, with the polymerization mixture at conditions such that the previously formed rubber particles remain dispersed throughout the continuous polymer phase and wherein the newly added rubber comprises from 5 to 30 weight percent of the rubber of the first and second rubber/monomer solutions and is dispersed as discrete particles having a volume average diameter from 4 to 10 micrometer.
Claim 12
Independent Claim
179 words
A method for preparing a rubber-reinforced polymer of one or more monovinylidene aromatic compounds having rubber of two different particle sizes dispersed through the aromatic polymer matrix, the method comprising the steps of mass polymerizing a first mixture comprising a solution of one or more polymerizable monovinylidene aromatic compounds and a rubber in the presence of an initiator which promotes polymer grafting to the rubber and at conditions sufficient to form a continuous phase containing polymer of monovinylidene aromatic compound and discrete particles of highly grafted rubber particles having a volume average diameter from 0.5 to 1.5 micrometer; subsequently admixing a second rubber--containing mixture, which rubber can be the same as or different from the rubber of the first mixture, with the polymerization mixture at conditions such that the previously formed rubber particles remain dispersed throughout the continuous polymer phase and wherein the newly added rubber comprises from 5 to 30 weight percent of the rubber of the first and second rubber/monomer solutions and is dispersed as discrete particles having a volume average diameter from 4 to 10 micrometer.
Claim 13
Dependent Claim
27 words
The method of Claim 9 wherein the rubber in the second rubber-containing mixture is pre-grafted prior to the addition of the second mixture to the polymerization mixture.
Claim 14
Dependent Claim
107 words
The method of Claim 9 wherein the polymerization is conducted using continuous, mass polymerization techniques and the first mixture, prior to admixture with the second rubber-containing mixture, is polymerized at conditions sufficient to form a continuous phase comprising a partial polymerizate of the monovinylidene aromatic compound having the highly grafted, rubber particles of the desired size dispersed therethrough, the second rubber-containing mixture comprises a solution of rubber and one or more polymerizable monovinylidene aromatic compounds and, after the admixture of the first and second mixtures, polymerization is subsequently completed and the polymerization mixture subjected to conditions sufficient to remove the unreacted monomers and to crosslink the rubber.
Claim 15
Dependent Claim
115 words
The method of Claim 9 wherein, prior to admixture with the second rubber-containing mixture, the first mixture is polymerized at conditions sufficient to form a continuous phase comprising a partial polymerizate of the monovinylidene aromatic compound having the highly grafted, rubber particles of the desired size dispersed therethrough and the second rubber-containing mixture is polymerized at conditions sufficient to form a continuous phase comprising a partial polymerizate of one or more monovinylidene aromatic compounds having rubber particles of the desired size dispersed therethrough and, after the admixture of the first and second mixtures, polymerization is subsequently completed and the polymerization mixture subjected to conditions sufficient to remove the unreacted monomers and to crosslink the rubber.
References Cited (Backward Citations)
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