Patent US1699985A successfully refreshed from Google Patents.
Patent EP0349232A2 successfully refreshed from Google Patents.
EP0349232A2
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EP
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Acrylic copolymers and method of making the same
Assignee: 3M Co
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Filing: 1989-06-26
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Granted: —
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Expires: 2009-06-26
Abstract
Abstract The present invention provides novel acrylic block copolymers and a method of making the same by use of an iniferter as a means of promoting, controlling and terminating polymerization. The method involves mixing an iniferter with a first polymer charge of acrylic monomer polymerizable to an acrylic block, exposing the mixture to an energy source to cause the iniferter to dissociate to form free radicals, permitting the first monomer charge to polymerize, terminating the exposure, adding a second monomer charge polymerizable to a second polymer block and again exposing the mixture to produce free radicals, permitting the second monomer charge to polymerize, and terminating the second exposure.
Inventors
- 👤 H. Andrus Jr. C/O Minnesota Mining And Milton
- 👤 B. Ali C/O Minnesota Mining And Mahfuza
- 👤 Roger A. C/O Minnesota Mining And Olsen
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 22:40
CPC Classifications
C; C08; C08F; C08F220/00; C08F293/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
135 words
A copolymer characterized by the general formula I(BAT) n wherein I represents the free radical initiator portion of an iniferter of the formula I(T) n T represents the termination portion of said iniferter; n is an integer of at least 2; B represents a first polymer block selected from the group consisting of (i) an elastic acrylic polymer block having a glass transition temperatures of less than 0°C; and (ii) a normally thermoplastic polymer block having a glass transition temperature of at least 50°C; and A represents a second polymer block selected from the group consisting of polymer block (i) and polymer block (ii) which was not selected as said first polymer block the weight ratio of said acrylic polymer block to said thermoplastic block in said block copolymer being from about 5:95 to 40:60.
Claim 2
Dependent Claim
135 words
A copolymer characterized by the general formula I(BAT) n wherein I represents the free radical initiator portion of an iniferter of the formula I(T) n T represents the termination portion of said iniferter; n is an integer of at least 2; B represents a first polymer block selected from the group consisting of (i) an elastic acrylic polymer block having a glass transition temperatures of less than 0°C; and (ii) a normally thermoplastic polymer block having a glass transition temperature of at least 50°C; and A represents a second polymer block selected from the group consisting of polymer block (i) and polymer block (ii) which was not selected as said first polymer block the weight ratio of said acrylic polymer block to said thermoplastic block in said block copolymer being from about 5:95 to 40:60.
Claim 3
Dependent Claim
53 words
The copolymer of claim 1 further characterized by said elastic acrylic polymer block being formed of a monomer comprising at least one monomeric acrylic or methacrylic acid ester of a non-tertiary alcohol, said alcohol having from 1 to 14 carbon atoms with the average number of carbon atoms being about 4 to 12.
Claim 4
Dependent Claim
34 words
The copolymer of claim 2 further characterized by the selection of said monomeric acrylic or methacrylic acid ester from the group consisting of 2-butyl acrylate, isooctyl acrylate, 2-ethylhexyl acrylate, 2-methylbutyl acrylate, and N-butyl acrylate.
Claim 5
Dependent Claim
45 words
The copolymer of claim 1 further characterized by the formation of said thermoplastic polymer block of monomer selected from the group consisting of methyl methacrylate, polystyrylethyl methacrylate macromer, methyl methacrylate macromer, acrylic acid, acrylonitrile, isobornyl methacrylate, N-vinyl pyrrolidone, t-butyl methacrylate, isopropyl methacrylate and mixtures thereof.
Claim 6
Dependent Claim
124 words
The copolymer of claim 1 represented by the formula wherein R₁, R₂, R₃, and R₄ are aliphatic or aromatic moieties which can be the same or different and which do not substantially interfere with the ability of I· to promote free radical polymerization or with the ability of T· to recombine with I· or a polymer free radical segment including I·; Y is a linking group having a functionality of x+y which does not substantially interfere with the ability of I· to promote free radical polymerization or the ability of T· to recombine with I· or a polymer free radical segment including I·; and x and y are each integers of at least 1 and the sum of x+y is not more than 12.
Claim 7
Dependent Claim
13 words
The copolymer of claim 1 further characterized by the representation by the formula
Claim 8
Dependent Claim
27 words
The copolymer of claim 1 further characterized by the selection of said iniferter from the group consisting of xylylene bis (N,N-diethyl dithiocarbamate) and xylylene bis (N-carbazolyl dithiocarbamate).
Claim 9
Dependent Claim
12 words
A sheet material further characterized by comprising the copolymer of claim 1.
Claim 10
Independent Claim
392 words
A method of making a copolymer further characterized by comprising the steps: (a) mixing (1) an iniferter represented by the general formula I(T) n capable upon being subjected to an appropriate energy source of forming free radicals I(·) n and nT· wherein n is an integer of at least 2, I· is a highly reactive free radical capable of initiating free radical polymerization, and T· is a less reactive free radical which is generally much less capable of initiating free radical polymerization than I· but will rejoin with I(·) n or a free radical polymer segment free radically polymerized with I(·) n upon termination of said energy source and (2) a first monomer charge selected from the group consisting of (i) acrylic monomer polymerizable to form an acrylic polymer block having a glass transition temperature of less than 0°C and (ii) monomer polymerizable to form a thermoplastic polymer block having a glass transition temperature of at least 50°C which is free radically polymerizable in the presence of I(·) n to form a first polymer block; (b) exposing the mixture of (a) to an energy source capable of forming free radicals I(·) n and nT·; (c) maintaining the exposure of (b) until said first monomer charge polymerizes with I(·) n to form a free radical polymer segment represented by the formula I(B·) n wherein B represents said first polymer block formed of said first mononer charge; (d) terminating said exposure whereby to cause I(B·) n and nT· to combine to form a polymer represented by the formula I(BT) n ; (e) mixing I(BT) n with a second monomer charge which is the member of the group consisting of monomer (i) and monomer (ii) which was not selected as said first monomer comprising monomer which is free radically polymerizable in the presence of I(B·) n to a second polymer block; (f) exposing I(BT) n to an energy source capable of forming free radicals I(B·) n and nT·; (g) maintaining the exposure of (f) until said second monomer charge polymerizes with I(B·) n to form a free radical block copolymer segment represented by the formula I(BA·) n wherein A represents said second polymer block formed of said second monomer charge; and (h) terminating the exposure of (f) whereby I(BA·) n and nT· combine to form a block copolymer represented by the formula I(BAT) n .
Claim 11
Independent Claim
392 words
A method of making a copolymer further characterized by comprising the steps: (a) mixing (1) an iniferter represented by the general formula I(T) n capable upon being subjected to an appropriate energy source of forming free radicals I(·) n and nT· wherein n is an integer of at least 2, I· is a highly reactive free radical capable of initiating free radical polymerization, and T· is a less reactive free radical which is generally much less capable of initiating free radical polymerization than I· but will rejoin with I(·) n or a free radical polymer segment free radically polymerized with I(·) n upon termination of said energy source and (2) a first monomer charge selected from the group consisting of (i) acrylic monomer polymerizable to form an acrylic polymer block having a glass transition temperature of less than 0°C and (ii) monomer polymerizable to form a thermoplastic polymer block having a glass transition temperature of at least 50°C which is free radically polymerizable in the presence of I(·) n to form a first polymer block; (b) exposing the mixture of (a) to an energy source capable of forming free radicals I(·) n and nT·; (c) maintaining the exposure of (b) until said first monomer charge polymerizes with I(·) n to form a free radical polymer segment represented by the formula I(B·) n wherein B represents said first polymer block formed of said first mononer charge; (d) terminating said exposure whereby to cause I(B·) n and nT· to combine to form a polymer represented by the formula I(BT) n ; (e) mixing I(BT) n with a second monomer charge which is the member of the group consisting of monomer (i) and monomer (ii) which was not selected as said first monomer comprising monomer which is free radically polymerizable in the presence of I(B·) n to a second polymer block; (f) exposing I(BT) n to an energy source capable of forming free radicals I(B·) n and nT·; (g) maintaining the exposure of (f) until said second monomer charge polymerizes with I(B·) n to form a free radical block copolymer segment represented by the formula I(BA·) n wherein A represents said second polymer block formed of said second monomer charge; and (h) terminating the exposure of (f) whereby I(BA·) n and nT· combine to form a block copolymer represented by the formula I(BAT) n .
References Cited (Backward Citations)
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