摘要:
A polymeric binder system useful for a magnetic recording medium, the polymeric binder system and comprising a hard resin component comprising a nonhalogenated vinyl copolymer and a soft resin component comprising a polyurethane having a phosphonate diester group. The binder system is useful for preparing the magnetic layer and/or backside coating of magnetic recording media, in order to provide media that demonstrate an improved combination of such as modulus, Tg, and smoothness.
摘要:
A polymeric binder system useful for a magnetic recording medium, the polymeric binder system and comprising a hard resin component comprising a nonhalogenated vinyl copolymer and a soft resin component comprising a polyurethane having a phosphonate diester group. The binder system is useful for preparing the magnetic layer and/or backside coating of magnetic recording media, in order to provide media that demonstrate an improved combination of such as modulus, Tg, and smoothness.
摘要:
Magnetic recording medium, comprising a magnetic layer provided on a nonmagnetizable substrate, wherein the magnetic layer comprises a magnetic pigment dispersed in a polymeric binder. The polymeric binder comprises a nonhalogenated vinyl copolymer, wherein the vinyl copolymer comprises a plurality of pendant nitrile groups, a plurality of pendant hydroxyl groups, and at least one pendant dispersing group. Preferably, the binder also includes a secondary polymer component.
摘要:
The invention relates to a sulfonated, thiol, and hydroxy-functional polyurethane polymer which comprises: (i) a polyurethane backbone; (ii) at least one SO.sub.3 M group pendant from the polyurethane backbone, wherein the polyurethane backbone has an SO.sub.3 M equivalent weight of from about 2,000 to about 100,000, and wherein M is selected from the group consisting of H.sup.+, NR.sub.4.sup.+ wherein R can be H.sup.+ or an alkyl group, Li.sup.+, Na.sup.+, K.sup.+, and mixtures thereof; (iii) at least two crosslinkable hydroxy groups pendant from the polyurethane backbone, wherein the polyurethane backbone has a hydroxy equivalent weight of from about 500 to about 50,000; and (iv) at least one --SD group pendant from the polyurethane backbone. The invention also relates to vinyl/polyurethane copolymers made therewith which are particularly useful as binders in magnetic recording media and a method of making the copolymers. The invention also relates to certain nonsulfonated thiol and hydroxy functional polyurethane graft copolymers and dispersions made therewith.
摘要:
In one aspect, the invention provides a water-based release coating composition comprising a mixture of: A. from 0.1 to about 5 wt % of a fluoro(meth)acrylate (co)polymer or a fluorochemical urethane compound containing at least one fluorinated group having the formula —CF2)nCF3, wherein n is an integer from 1 to 3; B. from about 5 to about 99.9 wt % of a copolymer comprising the reaction product of a. from about 40 to about 70 wt % of an alkyl (meth)acrylate, wherein the alkyl group contains from 16 to 22 carbon atoms, b. from about 3 to about 20 wt % of (meth)acrylic acid, c. from about 20 to about 40 wt % acrylonitrile, and d. from 0 to about 15 wt % of vinyl monomer, other than acrylonitrile, wherein the sum of a. through d. equals 100%; and C. from 0 to about 94.9 wt % of an extender polymer, wherein the sum of A., B., and C. is 100% and wt % is based on the total amount of solids in the composition.
摘要:
The invention provides novel macromonomer and carboxyl functional polyurethanes having a high carboxyl content. The invention further provides dispersions, coatings and magnetic recording media comprising these polyurethanes, or blends or copolymers of these polyurethanes with quaternary ammonium compounds. The invention further provides novel dispersions, coatings and magnetic recording media comprising combinations of carboxyl functional polyurethanes having a high carboxyl content with quaternary ammonium polymers.
摘要:
The invention relates to a sulfonated, thiol, and hydroxy-functional polyurethane polymer which comprises: (i) a polyurethane backbone; (ii) at least one SO.sub.3 M group pendant from the polyurethane backbone, wherein the polyurethane backbone has an SO.sub.3 M equivalent weight of from about 2,000 to about 100,000, and wherein M is selected from the group consisting of H.sup.+, NR.sub.4.sup.+ wherein R can be H.sup.+ or an alkyl group, Li.sup.+, Na.sup.+, K.sup.+, and mixtures thereof; (iii) at least two crosslinkable hydroxy groups pendant from the polyurethane backbone, wherein the polyurethane backbone has a hydroxy equivalent weight of from about 500 to about 50,000; and (iv) at least one --SH group pendant from the polyurethane backbone. The invention also relates to vinyl/polyurethane copolymers made therewith which are particularly useful as binders in magnetic recording media and a method of making the copolymers. The invention also relates to certain nonsulfonated thiol and hydroxy functional polyurethane graft copolymers and dispersions made therewith.
摘要:
Blended release materials including a blend of a fluoro-functional silicone release polymer and a fluoropolymer are described. Exemplary fluoropolymers include fluoroolefin-based polymers and linear fluoropolymers including linear fluoroacryaltes. Articles including such release materials such as release liners, and adhesive articles, including silicone adhesive articles, are also described.
摘要:
Copolymers containing at least one perfluoropolyether segment and at least one polydiorganosiloxane segments are described. The copolymers further contain multiple aminooxalylamino groups that link the various segments together. Methods of making the copolymers are also described.
摘要:
A composition comprises a copolymer comprising repeating units derived from at least one co-reactant comprising two or more acrylate groups and repeating units derived from a fluoroacrylate comprising the reaction product of: (a) at least one fluorochemical alcohol represented by the formula: C4F9—X—OH wherein: R=hydrogen or an alkyl group of 1 to 4 carbon atoms, m=2 to 8, Rf=CnF2+1, n=1 to 5, y=0 to 6, and q=1 to 8; (b) at least one unbranched symmetric diisocyanate; and (c) at least one hydroxy-terminated alkyl (meth)acrylate or 2-fluoroacrylate monomer having 2 to about 30 carbon atoms in its alkylene portion; wherein the composition is coatable.
摘要翻译:组合物包含共聚物,其包含衍生自至少一种包含两个或更多个丙烯酸酯基团的共反应物的重复单元和衍生自氟代丙烯酸酯的重复单元,所述重复单元包含以下反应产物:(a)至少一种由下式表示的含氟醇: in-line-formula description =“In-line Formulas”end =“lead”?> C sub> 3 sub> -X-OH <?in-line-formula description 其中:R =氢或1至4个碳原子的烷基,m = 2至8,R f = C 1, n = 2〜1,n = 1〜5,y = 0〜6,q = 1〜8; (b)至少一种非支化对称二异氰酸酯; 和(c)至少一种羟基封端的(甲基)丙烯酸烷基酯或其亚烷基部分具有2-30个碳原子的2-氟丙烯酸酯单体; 其中所述组合物是可涂覆的。