Encapsulated stabilizer compositions

Patent metadata

Field	Value
Publication number	US-10974417-B2
Application number	US-201615748861-A
Country	US
Kind code	B2
Filing date	Jul 29, 2016
Priority date	Jul 31, 2015
Publication date	Apr 13, 2021
Grant date	Apr 13, 2021

Abstract

Resin masterbatch compositions are provided as closed end pellets having a core including at least one additive and an outer layer comprising a polymer encapsulating the core, in which the thickness of the outer layer if from 0.001 mm to 1 cm. A stabilized composition is prepared from an organic material to be stabilized and the resin masterbatch composition. A process for producing the resin masterbatch composition includes co-extruding in tubular form a core material encapsulated by an outer layer, wherein the core material comprises at least one additive, and the outer layer comprises a polymer, to form a filled tube; passing the filled tube into a sealing device that cuts the filled tube into multiple discrete segments seals and simultaneously seals each end of each discrete segment, thereby forming closed end pellets; and cooling the closed end pellets.

First claim

We claim:

1. A resin masterbatch composition provided as closed end pellets, said composition comprising
a core material comprising a stabilizing amount of at least one stabilizer additive; and
an outer layer comprising a thermoplastic polymer, wherein the outer layer has a thickness of from 0.001 mm to 1 cm, and wherein the outer layer is co-extruded with and encapsulates said core material such that the pellets are sealed at each end and are leak-free.

2. The resin masterbatch composition as defined in claim 1 , wherein the stabilizer additive comprises at least one compound selected from the group consisting of a hindered amine light stabilizers (HALS), an organic phosphite or phosphonite, a hindered phenol, a chromane, an ultraviolet light (UV) absorber, a hindered benzoate, a hydroxylamine, a tertiary amine oxide, and a free radical polymerization inhibitor.

3. The resin masterbatch composition as defined in claim 2 , wherein the stabilizer additive comprises hindered amine light stabilizers selected from esters of 2,2,6,6-tetramethyl-4-piperidinol with C 12-2 -saturated and C 18 -unsaturated fatty acids.

4. The resin masterbatch composition as defined in claim 2 , wherein the stabilizer additive comprises at least one free radical polymerization inhibitor selected from the group consisting of phenothiazine, a phenothiazine derivative, hydroquinone, hydroquinone monomethyl ether (MEHQ), and tent-butyl catechol (TBC).

5. The resin masterbatch composition as defined in any one of claims 1 to 4 , wherein the thermoplastic polymer comprises at least one member selected from the group consisting of: polyolefins, polyesters, polyethers, polyketones, polyamides, natural and synthetic rubbers, polyurethanes, polystyrenes, high-impact polystyrenes, polyacrylates, polymethacrylates, polyacetals, polyacrylonitriles, polybutadienes, acrylonitrile-butadiene-styrene terpolymers, styrene-acrylonitrile copolymers, acrylate-styrene-acrylonitrile terpolymers, cellulosic acetate butyrate, cellulosic polymers, polyimides, polyamideimides, polyetherimides, polyphenylene sulfides, polyphenylene oxides, polysulfones, polyethersulfones, polyvinyl chlorides, polycarbonates, and ethylene-vinyl acetate copolymers.

6. The resin masterbatch composition as defined in claim 5 , wherein the thermoplastic polymer comprises of polyethylene, polypropylene, a polypropylene copolymer, polystyrene, or a styrene-acrylonitrile copolymer.

7. The resin masterbatch composition as defined in claim 1 or claim 2 , wherein the core material further comprises a thermoplastic polymer diluent that is the same or different than the thermoplastic polymer in the outer layer.

8. The resin masterbatch composition as defined in claim 1 or claim 2 , wherein the outer layer further comprises at least one stabilizer additive.

9. A process for producing the resin masterbatch composition as defined in claim 1 , the process comprising:
co-extruding a core material encapsulated by an outer layer to form a filled tube, wherein the core material comprises a stabilizing amount of at least one stabilizer additive, and the outer layer comprises a thermoplastic polymer having a thickness from 0.001 mm to 1 cm;
passing the filled tube into a sealing device that cuts the filled tube into multiple discrete segments and simultaneously seals each end of each discrete segment, thereby forming closed end pellets that are leak free; and
cooling the closed end pellets.

10. The process as defined in claim 9 , wherein at least two filled tubes are simultaneously extruded, cut, sealed, and cooled with the same device, to form at least two process streams of closed end pellets.

11. A resin masterbatch composition as defined in claim 5 , wherein the core material is solid, semi-solid, waxy, or liquid at 25° C., and is from 10 wt. % to 95 wt. % of the total weight of the closed end pellet.

12. A resin masterbatch composition as defined in claim 11 , wherein the core material is from 30 wt. % to 90 wt. % of the total weight of the closed end pellet.

13. A resin masterbatch composition as defined in claim 10 , wherein the core material is from 40 wt. % to 80 wt. % of the total weight of the closed end pellet.

Assignees

• Cytec Ind Inc

Inventors

• Tijhuis Dinand
• Tijhuis Erwin
• KOZAKIEWICZ Joseph
• Eng Jerry Mon Hei
• Gupta Ram B
• Vanzin David
• Majmudar Shailesh

Classifications

• C09K15/00

  Anti-oxidant compositions; Compositions inhibiting chemical change ({for use in well-specified applications, see the relevant places, e.g. in etching or pickling compositions C09K13/00, C23G} , in foodstuffs A21D, A23, {in association with organic compounds C07C, C07D} , in macromolecular compositions C08; in liquid fuels or lubricants C10; in fats, fatty substances, fatty oils or waxes C11B5/00; in detergents C11D; {coating or impregnating carbon or graphite based bodies to protect them from oxidation C04B41/45} ; corrosion inhibiting compositions for metallic material C23F11/00) · CPC title

• C08L101/00

  Compositions of unspecified macromolecular compounds · CPC title

• C08K9/10

  Encapsulated ingredients · CPC title

• C08J3/22

  using masterbatch techniques · CPC title

• B29B9/14

  fibre-reinforced · CPC title