Polyolefin compositions for building materials

Patent metadata

Field	Value
Publication number	US-10428204-B2
Application number	US-201415025015-A
Country	US
Kind code	B2
Filing date	Sep 24, 2014
Priority date	Sep 27, 2013
Publication date	Oct 1, 2019
Grant date	Oct 1, 2019

Abstract

Polyolefin compositions useful for construction articles for outdoor use, for instance house siding, cladding, soffit or roofing. The compositions comprise a polyolefin substrate which has incorporated therein one or more additives selected from the group consisting of a) one or more ultraviolet light absorbers, b) one or more hindered amine light stabilizers and c) one or more antioxidants. Advantageously, the polyolefin substrate also has incorporated therein d) one or more colorants, e) one or more fillers, f) one or more flame retardants and optionally g) one or more antimicrobial compounds. The compositions exhibit certain performance levels according to standard tests, for example impact strength of >35 in-lb per ASTM D4226, coefficient of linear thermal expansion of <4.5×10E-05 in/in/ft per ASTM D696 and optionally acceptable color uniformity in finished siding parts per ASTM D6864 and/or acceptable low delta E color for the intended application per ASTM D2244 and/or a UL-94 V-1 or V-0 rating and/or a flame spread index of <200 according to ASTM E-84.

First claim

The invention claimed is:

1. An extruded article comprising a polyolefin substrate having incorporated therein one or more additives comprising:
about 0.10 to about 2.5 weight percent, in total, of one or more ultraviolet light absorbers selected from the group consisting of hexadecyl 3,5-di-tert-butyl-4-hydroxybenzoate and 2,4-di-tert-butylphenyl 3,5-di-tert-butyl-4-hydroxybenzoate;
about 0.10 to about 1.9 weight percent, in total, of a binary or ternary hindered amine light stabilizer combination selected from the group consisting of:
(2) bis(2,2,6,6-tetramethylpiperidin-4-yl) sebacate and (45) oligomeric compound condensate of 4,4′-hexamethylenebis(amino-2,2,6,6-tetramethylpiperidine) and 2,4-dichloro-6-[(2,2,6,6-tetramethylpiperidin-4-yl)butylamino]-s-triazine end-capped with 2-chloro-4,6-bis(dibutylamino)-s-triazine;
(20) 2,2,6,6-tetramethylpiperidin-4-yl octadecanoate and a (45) oligomeric condensate of 4,4′-hexamethylenebis(amino-2,2,6,6-tetramethylpiperidine) and 2,4-dichloro-6-[(2,2,6,6-tetramethylpiperidin-4-yl)butylamino]-s-triazine end-capped with 2-chloro-4,6-bis(dibutylamino)-s-triazine;
(2) bis(2,2,6,6-tetramethylpiperidin-4-yl) sebacate and (20) 2,2,6,6-tetramethylpiperidin-4-yl octadecanoate;
(2) bis(2,2,6,6-tetramethylpiperidin-4-yl) sebacate, (14) 1-(2-hydroxy-2-methyl-propoxy)-4-octadecanoyloxy-2,2,6,6-tetramethylpiperidine and a (45) oligomeric condensate of 4,4′-hexamethylenebis(amino-2,2,6,6-tetra-methylpiperidine) and 2,4-dichloro-6-[(2,2,6,6-tetramethylpiperidin-4-yl)butylaminol-s-triazine end-capped with 2-chloro-4,6-bis(dibutylamino)-s-triazine; and
(14) 1-(2-hydroxy-2-methylpropoxy)-4-octadecanoyloxy-2,2,6,6-tetramethylpiperidine, (20) 2,2,6,6-tetramethylpiperidin-4-yl octadecanoate and a (45) oligomeric condensate of 4,4′-hexamethylenebis(amino-2,2,6,6-tetramethylpiperidine) and 2,4-dichloro-6-[(2,2,6,6-tetramethylpiperidin-4-yl)butylamino-s-triazine end-capped with 2-chloro-4,6-bis(dibutylamino)-s-triazine;

one or more additional additives selected from:
one or more antioxidants,
one or more colorants,
one or more flame retardants, or
one or more antimicrobial compounds;

wherein:
any two of the binary or ternary HALS combinations have a weight ratio from about 1:5 to about 5:1;
the weight percents being based on the weight of the polyolefin substrate;
the extruded article is in the form of a house siding, cladding, soffit, or roofing, and has a thickness of about 0.030 inches to about 0.070 inches and a weight of from about 0.18 lbs/ft 2 to about 0.31 lbs/ft 2 ;

the polyolefin substrate comprises a nucleating agent and one or more fillers;
the nucleating agent comprises sodium benzoate, 2,2′-methylene-bis-(4,6-di-tert-butylphenyl)phosphate, zinc glycerolate, calcium salt of 1,2-dicarboxylic acid cyclohexane, aromatic trisamide compounds, cis-endo-bicyclo-[2.2.1]-heptane-2,3-dicarboxylic acid disodium salt, aluminum hydroxyl-bis[4-(tert-butyl)benzoate], 1,3:2,4-bis-(3,4-dimethylbenzylidene)sorbitol, 1,3:2,4-bis(4-methylbenzylidene)sorbitol, or 1,3:2,4-bis(3,4-dimethylbenzylidene)sorbitol; and
the extruded article exhibits impact strength of >35 in-lb measured according to ASTM D4226, coefficient of linear thermal expansion of <4.5×10E-05 in/in/ft measured according to ASTM D696, acceptable color uniformity in finished siding parts according to ASTM D6864, a low delta E color according to ASTM D2244 of ≤5.0, and optionally a UL-94 V-1 or V-0 rating and/or a flame spread index of <200 measured according to ASTM E-84.

2. The extruded article according to claim 1 , wherein the polyolefin substrate comprises polyethylene, polypropylene, ethylene/propylene copolymer, or a mixture of polypropylene and polyethylene.

3. The extruded article according to claim 1 , wherein:
the one or more ultraviolet light absorbers further comprise additional ultraviolet light absorbers selected from a group consisting of hydroxyphenylbenzotriazoles, tris-aryl-s-triazines, 2-hydroxybenzophenones and cyanoacrylates,
the one or more antioxidants are selected from a group consisting of organic phosphorus stabilizer/hindered phenolic antioxidant combinations, dialkylhydroxylamine stabilizers, organic phosphorus stabilizer/dialkylhydroxylamine stabilizer combinations, amine oxide stabilizers and organic phosphorus stabilizer/amine oxide stabilizer combinations,
the one or more colorants are selected from a group consisting organic and inorganic pigments,
the one or more fillers are selected from a group consisting of natural fibers and inorganic fillers, and
the one or more flame retardants are selected from a group consisting of chlorinated flame retardants, brominated flame retardants, phosphorus based flame retardants, metal hydroxide compounds, melamine based compounds, antimony compounds, borate compounds and other metal containing flame retardants.

4. The extruded article according to claim 1 , wherein:
the ultraviolet light absorbers further comprise additional ultraviolet light absorbers selected from a group consisting of 5-chloro-2-(3-t-butyl-2-hydroxy-5-methylphenyl)-2H-benzotriazole, 2-(3,5-bis-α-cumyl-2-hydroxyphenyl)-2H-benzotriazole, 4,6-diphenyl-2-(4-hexyloxy-2-hydroxyphenyl)-s-triazine, and 4,6-bis-(2,4-dimethylphenyl)-2-(2-hydroxy-4-octyloxyphenyl)-s-triazine, and 4-octyloxy-2-hydroxybenzophenone.

5. The extruded article according to claim 1 , wherein the binary or ternary combination of hindered amine stabilizers are selected from the group consisting of:
(2) bis(2,2,6,6-tetramethylpiperidin-4-yl) sebacate, (14) 1-(2-hydroxy-2-methyl-propoxy)-4-octadecanoyloxy-2,2,6,6-tetramethylpiperidine and (45) oligomeric condensate of 4,4′-hexamethylenebis(amino-2,2,6,6-tetra-methylpiperidine) and, 2,4-dichloro-6-[(2,2,6,6-tetramethylpiperidin-4-yl)butylamino]-s-triazine end-capped with 2-chloro-4,6-bis(dibutylamino)-s-triazine, and
(14) 1-(2-hydroxy-2-methylpropoxy)-4-octadecanoyloxy-2,2,6,6-tetramethyl-piperidine, (20) 2,2,6,6-tetramethylpiperidin-4-yl octadecanoate and (45) oligomeric condensate of 4,4′-hexamethylenebis(amino-2,2,6,6-tetramethylpiperidine) and 2,4-dichloro-6-[(2,2,6,6-tetramethylpiperidin-4-yl)butylamino]-s-triazine end-capped with 2-chloro-4,6-bis(dibutylamino)-s-triazine.

6. The extruded article according to claim 1 , wherein the polyolefin substrate further has incorporated therein:
a tris(2,4-di-tert-butylphenyl) phosphite/hindered phenolic antioxidant combination wherein the hindered phenolic antioxidants are selected from a group consisting of tris(3,5-di-tert-butyl-4-hydroxybenzyl) isocyanurate, 1,3,5-tris-(3,5-di-tert-butyl-4-hydroxybenzyl)-2,4,6-trimethylbenzene, the calcium salt of the monoethyl ester of 3,5-di-tert-butyl-4-hydroxybenzylphosphonic acid, pentaerythritol tetrakis [3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] and octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate,
N,N-di(C 16 -C 18 alkyl)hydroxylamine,
a tris(2,4-di-tert-butylphenyl) phosphite/N,N-di(C 16 -C 18 alkyl)hydroxylamine combination,
di(C 16 -C 18 )alkyl methyl amine oxide, or
a tris(2,4-di-tert-butylphenyl) phoshphite/di(C 16 -C 18 )alkyl methyl amine oxide combination.

7. The extruded article according to claim 1 , wherein the polyolefin substrate further has incorporated therein:
a tris(2,4-di-tert-butylphenyl) phosphite/pentaerythritol tetrakis [3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] combination,
a tris(2,4-di-tert-butylphenyl) phosphite/octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate combination, N,N-di(C 16 -C 18 alkyl)hydroxylamine,
a tris(2,4-di-tert-butylphenyl) phosphite/N,N-di(C 16 -C 18 alkyl)hydroxylamine combination,
di(C 16 -C 18 )alkyl methyl amine oxide, or
a tris(2,4-di-tert-butylphenyl) phosphite/di(C 16 -C 18 )alkyl methyl amine oxide combination.

Assignees

• Basf Se

Inventors

• Andrews Stephen Mark
• Fay Joseph James
• King Roswell Easton
• Zafar Mohammad
• Chen Zhisheng
• Thompson Thomas Friend
• Zuo Feng

Classifications

• C08K3/013 Primary

  Fillers, pigments or reinforcing additives · CPC title

• B32B27/32 Primary

  comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)} · CPC title

• Y10T428/2495

  Thickness [relative or absolute] · CPC title

• C08L23/12

  Polypropene · CPC title

• C08K3/015

  Biocides (macromolecular substances as carriers for biocide material A01N25/10) · CPC title