Morton International, Inc.

Phillips Petroleum Company

Rohm and Haas Company

Thiokol Corporation

Other

Owen H Decker

Charles P Tarnoski

Andrew T Daly

Karl R Wursthorn

Frank R Houda

Leo T Grundowski

Carl W Ernst

David A Mountz

Carlton Edwin Ash

Jon F Geibel

Darryl R Fahey

Jeno Muthiah

Richard P Haley

Dwayne R Senn

Eugene P Reinheimer

Neal A Mumford

James G Fotiou

Roy M Berstler

Matthew B Snyder

Lacey E Scoggins

Michael C Yu

Glenn D Correll

Fernando C Vidaurri

Harold D Yelton

Jimmie J Straw

Harvey D Hensley

Paul J Deslauriers

Wei-Teh W Shang

William E Sattich

Ben A Lloyd

Warren G Duncan

Michele Le Cramer

Dieter W Jungclaus

Lee F Spenser

Rex L Bobstein

Lee F Spencer

Systems, apparatus combinations and methods for producing a coating powder 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.

Continuous processing of powder coating compositions

Systems and apparatus combinations for producing a coating powder 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.

System for continuous processing of powder coating compositions

Coating powders are provided which provide high-temperature, translucent coatings useful for light-emitting devices such as incandescent bulbs. The coating powders comprise a binder, at least 90 wt % up to 100 wt % of which is a silicone resin. The coating powders are filled with between about 10 and about 50 phr of fillers selected from the group consisting of needle-like calcium metasilicate, mica, rod-like glass particles, and mixtures thereof, the fillers having aspect ratios between about 8 and about 40.

Translucent high-temperature powder coatings

Coating compositions comprising an epoxy resin and a curative which is methylenedisalicylic acid and/or a methylendisalicylic acid ring-substituted homologue are found to cure at and produce a wrinkle finish at relatively low temperatures when a borontrifluoride:amine complex is used as the cure catalyst.

Low temperature epoxy wrinkle coating powder

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.

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 or haze inhibitor which is comprised of a crystalline epoxy resin. When this powder blend is melted for curing, the crystalline crosslinker resin visually appears to separate and recrystallize out of the molten powder less completely than it does in the absence of the recrystallization or haze inhibitor. This prevents a visible haze from developing on the surface of the coating upon curing with UV radiation.

Non-hazing UV curable powder coatings containing crystalline resins

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;

Wrinkled epoxy powder coating with methylenedisalicylic acid, its

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. The polyhydroxyl component (B) is a polyhydroxyl compound or blends of polyhydroxyl compounds with average hydroxyl equivalent weight of between 100 and 500, containing an average of at least three hydroxyl groups per molecule, and of number average molecular weight between 300 and 20,000. The blend of the silicone resin (A) and polyhydroxyl component (B) should have a combined glass transition temperature (T.sub.g) of at least about 50.degree. C.

Coating powder for high temperature resistant coatings

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. The sum of un-reacted functional groups of adduct B) plus curing agent C) is at a stoichiometric equivalent relative to said carboxylic acid functionality of said acrylic polymer A) of between about 0.5 and about 1.5. Using sufficient amounts of an appropriate cure catalyst, the composition may be fused and cured at temperatures of 300.degree. F. or below, even 250.degree. C. or below, making the coating composition suitable for coating wood and wood products.

Flexible, weatherable, acrylic coating powder

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.

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.

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Wyomissing, PA, United States of America

Owen H Decker