US4478974A
Expired / Lapsed
US
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Heterogeneous polymer latex of relatively hard and relatively soft interpolymers of a monovinylidene aromatic monomer and an aliphatic conjugated diene monomer
Assignee: Dow Chemical Co
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Filing: 1983-08-04
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Granted: 1984-10-23
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Expires: 2003-08-04
Abstract
Abstract Aqueous latexes of heterogeneous polymer particles comprising (1) a minor portion of a soft interpolymer domain having a glass transition temperature of less than 25° C. and comprising a monovinylidene aromatic monomer such as styrene and an open chain aliphatic conjugated diene such as 1,3-butadiene and (2) a major portion of a relatively hard interpolymer domain having a glass transition temperature greater than 25° C. and comprising a monovinylidene aromatic monomer such as styrene; an open chain aliphatic conjugated diene monomer such as 1,3-butadiene and a functional monomer such as acrylic acid are useful as binders for pigmented paper coating compositions. The coated papers of the invention exhibit an excellent combination of binding strength and stiffness.
Inventors
- 👤 Do I. Lee
- 👤 Traute Mundorf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:44
CPC Classifications
D; D21; D21H; D21H19/00; D21H19/36; D21H19/44; D21H19/56; D21H19/58; C; C08; C08F; C08F236/00; C08F236/02; C08F236/04; C08F236/10; C08F257/00; C08F257/02; C08L; C08L25/00; C08L25/02; C08L25/04; C08L25/08; C08L25/10; C08L9/00; C08L9/06; C08L9/08; C08L2205/00; C08L2205/02; Y; Y10; Y10S; Y10S525/00; Y10S525/902
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
194 words
An aqueous synthetic polymer latex, the dispersed polymer particles of which are heterogeneous and individually comprise per 100 parts by weight of the polymer particle: (a) from about 20 to about 45 parts by weight of a relatively soft interpolymer domain having a glass transition temperature less than about 25° C. and comprising in polymerized form and based upon the total soft interpolymer: (1) from about 25 to about 65 weight percent of a monovinylidene aromatic monomer; and (2) from about 35 to about 75 weight percent of an open chain aliphatic conjugated diene monomer; and (b) from about 55 to about 80 parts by weight of a relatively hard interpolymeric domain having a glass transition temperature greater than 25° C. and comprising, in polymerized form and based upon the total hard interpolymer portion: (1) from about 70 to about 90 weight percent of a monovinylidene aromatic monomer; (2) from about 10 to about 30 weight percent of an open chain aliphatic conjugated diene monomer; and (3) from about 0.5 to about 11 weight percent of a functional compound selected from the class consisting of addition polymerizable carboxylic acids, hydroxyalkyl acrylates, and hydroxyalkyl methacrylates.
Claim 2
Dependent Claim
194 words
An aqueous synthetic polymer latex, the dispersed polymer particles of which are heterogeneous and individually comprise per 100 parts by weight of the polymer particle: (a) from about 20 to about 45 parts by weight of a relatively soft interpolymer domain having a glass transition temperature less than about 25° C. and comprising in polymerized form and based upon the total soft interpolymer: (1) from about 25 to about 65 weight percent of a monovinylidene aromatic monomer; and (2) from about 35 to about 75 weight percent of an open chain aliphatic conjugated diene monomer; and (b) from about 55 to about 80 parts by weight of a relatively hard interpolymeric domain having a glass transition temperature greater than 25° C. and comprising, in polymerized form and based upon the total hard interpolymer portion: (1) from about 70 to about 90 weight percent of a monovinylidene aromatic monomer; (2) from about 10 to about 30 weight percent of an open chain aliphatic conjugated diene monomer; and (3) from about 0.5 to about 11 weight percent of a functional compound selected from the class consisting of addition polymerizable carboxylic acids, hydroxyalkyl acrylates, and hydroxyalkyl methacrylates.
Claim 3
Dependent Claim
60 words
The polymer latex of claim 1 wherein the soft interpolymer domain constitutes from about 20 to about 40 parts by weight and wherein the relatively hard interpolymer domain constitutes from about 60 to about 80 parts by weight, both being based upon a total of 100 parts by weight of the dispersed heterogeneous polymer particles in such aqueous polymer latex.
Claim 4
Dependent Claim
61 words
The polymer latex of claim 1 wherein the dispersed heterogeneous polymer particles thereof individually comprise, on the basis of 100 parts by weight of such dispersed heterogeneous particles, an average of from about 20 to about 30 parts by weight of said soft interpolymer domain and from about 70 to about 80 parts by weight of said relatively hard interpolymer domain.
Claim 5
Dependent Claim
52 words
The polymer latex of claim 1 wherein the soft interpolymer domain further comprises, in polymerized form and based upon the total weight of such domain, from about 0.5 to about 11 weight percent of a functional compound selected from the class consisting of addition polymerizable carboxylic acids, hydroxyalkyl acrylates, and hydroxyalkyl methacrylates.
Claim 6
Dependent Claim
21 words
The polymer latex of claim 1 wherein the functional compound is present at from about 1 to about 10 weight percent.
Claim 7
Dependent Claim
28 words
The polymer latex of claim 4 wherein the functional compound in both the hard and soft polymer domains is present at about 1 to about 10 weight percent.
Claim 8
Dependent Claim
16 words
The polymer latex of claim 1 wherein the functional compound is a monoethylenically unsaturated carboxylic acid.
Claim 9
Dependent Claim
22 words
The polymer latex of claim 7 wherein the functional compound is acrylic acid, methacrylic acid, itaconic acid, fumaric acid, or maleic acid.
Claim 10
Dependent Claim
30 words
The polymer latex of claim 1 wherein the functional compound is a hydroxy C 2 to C 4 alkyl acrylate or a hydroxy C 2 to C 4 alkyl methacrylate.
Claim 11
Dependent Claim
16 words
The polymer latex of claim 9 wherein the functional compound is 2-hydroxyethyl acrylate or 3-hydroxypropyl acrylate.
Claim 12
Dependent Claim
26 words
The polymer latex of claim 1 wherein the monovinylidene aromatic monomer employed is styrene and wherein the open chain aliphatic conjugated diene monomer employed is 1,3-butadiene.
Claim 13
Dependent Claim
30 words
The polymer latex of claim 1 wherein the dispersed polymer particles thereof constitute from about 45 to about 60 weight percent of the total weight of such aqueous polymer latex.
Claim 14
Dependent Claim
29 words
The polymer latex of claim 1, wherein the dispersed polymer particles thereof have an average diameter of from about 80 to about 300 nanometers on a number average basis.
Claim 15
Dependent Claim
47 words
The aqueous polymer latex of claim 1 wherein the soft interpolymer portion of the dispersed polymer particles is in the form of a continuous soft interpolymer matrix and wherein the hard interpolymer portion thereof is dispersed within and/or distributed on the surface of such soft interpolymer matrix.
Claim 16
Dependent Claim
66 words
The aqueous polymer latex of claim 1 in which the soft interpolymer domain is prepared by polymerizing the monomer charge therefor in a first emulsion polymerization stage and wherein the hard interpolymer portion thereof is prepared by emulsion polymerizing its corresponding monomer charge in a second emulsion polymerization stage in an aqueous medium comprising the dispersed soft interpolymer particles resulting from said first stage emulsion polymerization.
Claim 17
Dependent Claim
194 words
A paper coating composition comprising, (i) a pigment; and (ii) from about 5 to about 30 dry parts by weight per 100 dry parts by weight of pigment of an aqueous synthetic polymer latex, the dispersed polymer particles of which are heterogeneous and individually comprise per 100 parts by weight of the polymer particle: (a) from about 20 to about 45 parts by weight of a relatively soft interpolymer domain having a glass transition temperature less than about 25° C. and comprising in polymerized form and based upon the total soft interpolymer: (1) from about 25 to about 65 weight percent of a monovinylidene aromatic monomer; and (2) from about 35 to about 75 weight percent of an open chain aliphatic conjugated diene monomer; and (b) from about 55 to about 80 parts by weight of a relatively hard interpolymeric domain having a glass transition temperature greater than 25° C. and comprising, in polymerized form and based upon the total hard interpolymer portion: (1) from about 70 to about 90 weight percent of a monovinylidene aromatic monomer; (2) from about 10 to about 30 weight percent of an open chain aliphatic conjugated diene monomer.
Claim 18
Dependent Claim
194 words
A paper coating composition comprising, (i) a pigment; and (ii) from about 5 to about 30 dry parts by weight per 100 dry parts by weight of pigment of an aqueous synthetic polymer latex, the dispersed polymer particles of which are heterogeneous and individually comprise per 100 parts by weight of the polymer particle: (a) from about 20 to about 45 parts by weight of a relatively soft interpolymer domain having a glass transition temperature less than about 25° C. and comprising in polymerized form and based upon the total soft interpolymer: (1) from about 25 to about 65 weight percent of a monovinylidene aromatic monomer; and (2) from about 35 to about 75 weight percent of an open chain aliphatic conjugated diene monomer; and (b) from about 55 to about 80 parts by weight of a relatively hard interpolymeric domain having a glass transition temperature greater than 25° C. and comprising, in polymerized form and based upon the total hard interpolymer portion: (1) from about 70 to about 90 weight percent of a monovinylidene aromatic monomer; (2) from about 10 to about 30 weight percent of an open chain aliphatic conjugated diene monomer.
Claim 19
Dependent Claim
21 words
A coated paper comprising a paper having a dried coating of the composition of claim 16 on at least one surface.
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