Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1983-01-05
1984-10-30
Lieberman, Allan M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524853, 524854, 525 70, 525 73, 525 74, 525 77, 525 78, 525 79, 525 80, 525278, C08J 302, C08L 5100, C08L 5106, C08L 5108
Patent
active
044800690
DESCRIPTION:
BRIEF SUMMARY
Reference is made to commonly assigned related applications Ser. No. 455,696 entitled "Non-aqueous Dispersions Based on Capped Stabilizers and Reactants Comprising Polyfunctional Monomers II", Ser. No. 455,687 entitled "Non-aqueous Dispersions Based on Capped Stabilizers and Vinyl Monomers II". and Ser. No. 455,701, entitled "Non-aqueous Dispersions Based on Capped Stabilizers and Reactants Comprising Polyfunctional Monomers I", all to Theodore et al and filed on Jan. 5, 1983. Further referencre is made to commonly assigned related U.S. applications, Ser. No. 468,901 entitled "Preparation of Non-aqueous Dispersions with use of Monofunctional Stabilizer" to Chattha et al., Ser. No. 468,902 entitled "Crosslinked Flow Control Additives for High Solids Paints II" to Chattha, and Ser. No. 468,912 entitled "Crosslinked Flow Control Additives for High Solids Paints I" to Cassatta et al, all filed Feb. 23, 1983.
TECHNICAL FIELD
This invention relates to stable, crosslinked polymer particles and non-aqueous dispersions containing such particles. More particularly, the invention relates to such stable crosslinked, preferably acrylic, polymer particles prepared in the presence of a polymeric dispersion stabilizer wherein the precursor of the first segment of the stabilizer comprises a long chain hydrocarbon molecule having only one reactive group per molecule, preferably being a carboxyl group and additionally preferably being present as a terminal reactive group on the molecule.
BACKGROUND ART
Suitable crosslinked acrylic polymer particles of the type which may employ the stabilizer of this invention are well known. U.S. Pat. No. 4,147,688 to Makhlouf et al teaches crosslinked dispersions wherein crosslinked acrylic polymer microgel particles are formed by free radical addition polymerization of alpha, beta ethylenically unsaturated monocarboxylic acids, at least one other copolymerizable monoethylenically unsaturated monomer and a certain percentage of crosslinking monomer, in the presence of a hydrocarbon dispersing liquid (See abstract, examples and claims). Other crosslinked dispersions containing microgel particles are disclosed in the patent application and patents referred to in the Makhlouf et al disclosure.
U.S. Pat. No. 4,025,474 to Porter et al discloses a polyester based coating composition which includes the crosslinked dispersions disclosed by Makhlouf et al. U.S. Pat. No. 4,075,141 to Porter et al discloses carboxylic acid amide interpolymer-based coating compositions including the same crosslinked dispersions. U.S. Pat. No. 4,115,472 also to Porter et al, discloses urethane coating compositions also including the crosslinked dispersions of Makhlouf et al. U.S. Pat. No. 4,055,607 to Sullivan et al discloses thermosetting compositions of (a) solution acrylic polymer, (b) at least 0.5% of microgel particles formed by polymerizing hydroxyl bearing monomers with nonhydroxyl bearing monomers in the presence of the stabilizer disclosed by Makhlouf et al, and (c) melamine resin. The microgel dispersion of Sullivan et al thus contains functionality capable of reacting with the melamine crosslinking agent.
The dispersion stabilizer employed in producing the microgel particles of the Makhlouf et al compositions are generally polymeric and contain at least two segments, with one segment being solvated by the dispersion liquid and the second segment being of different polarity than the first segment, and relatively insoluble, compared to the first segment, in the dispersing medium. Included among the dispersion stabilizers referred to in the Makhlouf et al patent are polyacrylates and methacrylates, such as poly (lauryl) methacrylate and poly (2-ethylhexylacrylate); diene polymers and copolymers such as polybutadiene and degraded rubbers; aminoplast resins, particularly high naphtha-tolerant compounds such as melamine formaldehyde resins etherified with higher alcohols (e.g., alcohols having 4 to 12 carbon atoms); and various copolymers designed to have desired characteristics (see Col. 5, lines 1-27).
Amon
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Chattha Mohinder S.
Theodore Ares N.
Ford Motor Company
Lieberman Allan M.
May Roger L.
Melotik Lorraine S.
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