Abstract: A coating powder for producing a high temperature resistant coating has a resin system which comprises (A) between about 50 and about 93 wt % based on total of (A) plus (B) of a silicone resin and (B) between about 7 and about 50 wt % based on total weight of (A) plus (B) of a polyhydroxyl component. The silicone resin (A) of the coating powder has organic substitutents selected from the group consisting of phenyl, methyl, C.sub.2 through C.sub.6 alkyl and mixtures thereof. The silicone resin has a viscosity of between about 500 and about 10,000 cps at 150.degree. C., a condensable hydroxyl content of between about 2 and about 4.5 wt %, and a glass transition temperature (T.sub.g) of about 55.degree. C. or above. The silicone resin preferably contains about 0.2% or less of organic solvents.

Abstract: Coating powder compositions comprise A) between about 60 and about 90 wt %, relative to total weight of A) plus B) plus C), of an acrylic polymer having a weight average molecular weight of between about 1000 and about 30,000, a carboxylic acid equivalent weight of from about 300 to about 1000 and a glass transition temperature of about 45.degree. C. or above and B) between about 5 and about 30 wt %, relative to total weight of A) plus B) plus C) of an adduct prepared from i) between about 20 and about 50 wt %, relative to total weight of i) plus ii), of a curing agent reactive with carboxylic acid groups and ii) between about 50 and about 80 wt %, relative to total weight of i) plus ii), of a polyester resin formed primarily from linear aliphatic diols and dicarboxylic acids, the polyester having functional groups reactive with said curing agent i), and C) between about 2 and about 30 wt % relative to the total weight of A) plus B) plus C) of a curing agent reactive with carboxylic acid groups.

Abstract: Coating powder compositions comprise A) between about 60 and about 90 wt %, relative to total weight of A) plus B) plus C), of an acrylic polymer having a weight average molecular weight of between about 1000 and about 30,000, a carboxylic acid equivalent weight of from about 300 to about 1000 and a glass transition temperature of about 45.degree. C. or above and B) between about 5 and about 30 wt %, relative to total weight of A) plus B) plus C) of an adduct prepared from i) between about 20 and about 50 wt %, relative to total weight of i) plus ii), of a curing agent reactive with carboxylic acid groups and ii) between about 50 and about 80 wt %, relative to total weight of i) plus ii), of a polyester resin formed primarily from linear aliphatic diols and dicarboxylic acids, the polyester having functional groups reactive with said curing agent i), and C) between about 2 and about 30 wt % relative to the total weight of A) plus B) plus C) of a curing agent reactive with carboxylic acid groups.

Abstract: This invention provides a UV curable powder coating composition comprising a particulate blend of a non-crystalline unsaturated polyester base resin, a crystalline unsaturated crosslinker resin co-polymerizable with the base resin, and a photoinitiator, that exhibits reduced or eliminated hazing in the cured coating formed therefrom upon being cured at low temperatures demanded by certain heat sensitive substrates. This is accomplished by incorporating in the powder composition a recrystallization inhibitor which is comprised of a crystalline epoxy resin. When this powder blend is melted for curing, all of the crystalline resin species tend to separate and recrystallize out of the molten powder slower and less completely than they do in the absence of the recrystallization inhibitor. This prevents a visible haze from quickly developing on the surface of the molten coating before the coating can be cured with UV radiation.

Abstract: A coating powder for providing a high temperature resistance coating has a silicone resin binder system which is either substantially all silicone resin or an --OH-- functional silicone resin adduct plus blocked, multi --NCO functional curative. The coating powder is pigmented with titanium dioxide which is either non-coated or coated with a sufficiently low level of an inorganic oxide such that when slurried in water, the pH is 7 or above. The coating powder preferably contains at least 40 phr mica and/or calcium metasilicate, preferably between 2 and about 20 phr aluminum. The coating powder may also contain zinc to protect the underlying substrate from corrosion and high-temperature pigments, particularly ceramic pigments.

Abstract: Systems and apparatus combinations for producing a powder coating are provided wherein a stream of a powder coating precursor including at least one resin and at least one additional powder coating ingredient is contacted with a process fluid effective to reduce the viscosity of the powder coating precursor to allow processing of the powder coating precursor at a lower temperature.

Abstract: A silicone resin for forming a coating powder has organic substitutents selected from the group consisting of phenyl, methyl, C.sub.2 through C.sub.6 alkyl and mixtures thereof; a viscosity of between about 500 and about 10,000 cps at 150.degree. C.; a condensable hydroxyl content of between about 2.0 and about 4.5 wt %; a glass transition temperature of about 55.degree. C. or above; and about 0.2% or less of organic solvent.

Abstract: An epoxy coating powder composition and a method for controlling the denseness of cured wrinkle finish patterns are provided by the use of a curing agent mixture comprising a blocked Lewis acid, methylenedisalicylic acid and a ring-substituted homolog thereof having the formula ##STR1## wherein x and y are from 1 to 3, and R.sup.1 and R.sup.2 are, independently, hydrogen, alkyl groups having from 1 to 20 carbon atoms, aryl groups having from 6 to 10 carbon atoms, or aryl-substituted methylene groups; with the proviso that when x=y=3, R.sup.1 and R.sup.2 .noteq.hydrogen;wherein the ratio of methylene disalicylic acid and the ring-substituted homolog is from about 50:50 to about 2:98 by weight.

Abstract: Powdered coating compositions and methods for obtaining improved wrinkled finishes with epoxy powder coatings are provided which utilize a color stabilizer effective to avoid an excessive red color shift upon cure of the composition.

Abstract: Powdered coating compositions and methods for obtaining improved wrinkled finishes with epoxy powder coatings are provided which utilize curing agents other than commercially available methylenedisalicylic acid.

Abstract: Systems, apparatus combinations and methods for producing a powder coating are provided wherein a stream of a powder coating precursor including at least one resin and at least one additional powder coating ingredient is contacted with a process fluid effective to reduce the viscosity of the powder coating precursor to allow processing of the powder coating precursor at a lower temperature.

Abstract: A coating powder based on an epoxy resin is applied to a substrate and fused and cured thereon. Curing is effected by exposing the coating powder at the point of application to a fluid curative or cure catalyst, e.g., by exposing the fusing coating powder to an ammonia-containing atmosphere.

Abstract: Powdered coating compositions and methods for obtaining improved wrinkled finishes with epoxy powder coatings are provided which utilize curing agents other than commercially available methylenedisalicylic acid.

Abstract: Coating powder compositions are formulated with epoxy-functional acrylic resins, and as curatives 5 to 50 phr poly-carboxylic functional polyesters and 5 to 40 phr poly-carboxylic functional crystalline curatives.

Abstract: A process is provided for producing a poly(arylene sulfide) polymer which employs at least one base as a reactant, wherein the base is contacted with the polymerization reaction mixture incrementally during the polymerization.

Abstract: A method is provided for forming poly(arylene sulfide) fibrids by flashing a solution which is comprised of a poly(arylene sulfide) polymer in a polar organic compound and which is essentially free of solids under suitable conditions to form a solidified product comprising poly(arylene sulfide) fibrids.

Abstract: Composite pressure vessels having improved fiber strength translation of the unidirectional, axial, impregnated strand or tow strength delivered in tensile strength of hoop fibers of the composite pressure vessel are obtained by a process in which chemorheologically viscosity tailored matrix resin formulations containing surface-active agents or compounds acting as surface-active agents are employed. The use of chemorheologically viscosity tailored matrix resin formulations containing such agents in such a process also reduces the strength variation of pressure vessels produced from prepreg of the matrix resin formulations containing surface-active agents or compounds acting as surface-active agents.

Abstract: A process for preparing arylene sulfide polymers is provided, comprising contacting an initiator compound, a halothiophenol compound, an polar organic compound, and a base. Blends comprising the inventive polymers and polyamides or polyaramides provide improved mechanical properties.

Abstract: A random copolymer composed of at least one arylene sulfide segment and at least one arylene aulfide sulfone segment is prepared by contacting at least one dihaloaromatic sulfide having a formula of X--Ar(R).sub.n --S--Ar.sup.1 (R.sup.1).sub.n --X.sup.1, with a mixture comprising at least one sulfur source and at least one dihaloaromatic sulfone having a formula of X.sup.2 --Ar.sup.2 (R.sup.2).sub.n --S(O.sub.2)--Ar.sup.3 (R.sup.3).sub.n --X.sup.3 in the presence of a polar organic compound under polymerization conditions to synthesize a random copolymer; where X, X.sup.1, X.sup.2, and X.sup.3 can be the same or different halogens and are each selected from the group consisting of fluorine, chlorine, bromine and iodine; Ar, Ar.sup.1, Ar.sup.2, and Ar.sup.3 are each an arylene group; R, R.sup.1, R.sup.2, and R.sup.

Abstract: A process for preparing a poly(arylene sulfide) and copolymer thereof from a poly(arylene sulfide disulfide) is provided which comprises contacting the poly(arylene sulfide disulfide) with a polyhalo-substituted cyclic compound having unsaturation between adjacent ring carbon atoms and having halogen atoms attached to the ring carbon atoms in a polar organic compound and a basic compound at an elevated temperature. Alternatively, the poly(arylene sulfide disulfide) can be substantially dissolved in the polar organic solvent at elevated temperature to form fragments which can be contacted with the polyhalo-substituted cyclic compound in a polar organic compound and a basic compound at an elevated temperature. The fragments also can be isolated, recovered and then contacted with the polyhalo-substituted cyclic compound in a polar organic compound and a basic compound at an elevated temperature.