Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
2001-05-16
2004-09-14
Wu, David W. (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C524S394000, C524S399000, C524S609000, C524S349000, C524S323000, C524S440000, C524S570000
Reexamination Certificate
active
06790888
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to the stabilization of thermoplastic resins that are in contact with metals or metal salts against thermo-oxidative degradation. More particularly, the present invention relates to the stabilization of thermoplastic resins that are in contact with metals or metal salts against thermo-oxidative degradation by use of blends of a dithiocarbamate, and a metal deactivator.
2. Description of Related Art
Manufacturers of plastic goods have experienced a long-standing problem in stabilizing plastic resins that, in use, come into contact with metals or metal salts. This problem is particularly acute in the wire and cable industry where thermoplastic sheaths or coatings are in contact with the underlying substrate, e.g., copper wire.
U.S. Pat. No. 3,001,969 discloses a thermoplastic heat-stable composition consisting primarily of a normally solid polypropylene, plus a stabilizing amount of a zinc di-lower alkyldithiocarbamate wherein the alkyl radicals contain at least two carbon atoms, especially zinc dibutyldithiocarbamate.
U.S. Pat. No. 3,322,802 discloses certain oxidized dithiocarbamates derived from divalent, trivalent, and tetravalent metals and methods for their preparation. The compounds are said to be high in biocidal activity and useful as industrial and agricultural bactericides and fungicides and as antifouling agents in paints. They are also said to be useful as vulcanization accelerators, as antioxidants in polymers, and as oxidation and wear inhibitors in lubricants.
U.S. Pat. No. 4,464,496 discloses a non-yellowing antioxidant-UV stabilizer combination especially useful in AES polymers comprising (A) at least one antioxidant selected from the group consisting of: (i) a thiodialkylene bis-(3,5-dialkyl-4-hydroxy) hydrocinnamate antioxidant; (ii) An N,N′-alkylene bis-(3,5-dialkyl-4-hydroxy) hydrocinnamamide antioxidant; (iii) an O,O-dialkyl-3,5-dialkyl-4-hydroxybenzyl phosphonate antioxidant; (iv) an oxamidobis alkyl (3,5)-dialkyl-4-hydroxyphenyl) propionate antioxidant; and (v) a [3-(3,5-dialkyl-4-hydroxyphenyl)propionamido]alkyl stearate antioxidant; and (B) a UV stabilizer package comprising: (vi) at least one UV stabilizer of the hindered amine type, with or without (vii) at least one UV absorber.
U.S. Pat. No. 4,469,609 discloses a stabilizing system useful for imparting resistance to oxidative breakdown comprising:
(1) a metal deactivator azine of the formula:
where: R
1
and R
2
can be hydrogen, alkyl with 1 to 12 carbon atoms, alkoxy with 1 to 12 carbon atoms, carbalkoxy with 1 to 12 carbon atoms, halogen, hydroxy, nitro and amino groups and X
1
and X
2
can be hydrogen, alkyl with 1 to 12 carbon atoms or di-, tri- or tetramethylene bridges to the aromatic ring;
(2) an amine;
(3) a metal compound selected from the group consisting of metals or metal salts; and
(4) a lubricating oil selected from the group consisting of mineral oils or synthetic hydrocarbon oils.
U.S. Pat. No. 4,797,511 discloses a composition stabilized against oxidative degradation comprising: a polyolefin, carbon black homogeneously incorporated in said polyolefin, a stabilizing amount of thiodiethylene bis(3,5-di-t-butyl-4-hydroxy)hydrocinnamate first stabilizer component incorporated into said polyolefin and a second stabilizer component of at least one amine antioxidant selected from the group consisting of a para-substituted aralkyl-substituted diphenylamine; a para-phenylenediamine and a polymerized dihydroquinoline incorporated into said polyolefin. U.S. Pat. No. 4,837,259 discloses polypropylene stabilized against oxidative degradation by the presence therein of a stabilizing amount of an antioxidant composition that comprises:
(a) at least one aralkyl-substituted diarylamine; and
(b) at least one sterically hindered phenol.
U.S. Pat. No. 6,080,929 discloses an improvement in a wire or cable system comprising a wire or cable portion, an insulation composition surrounding the wire or cable portion, a filler material surrounding the insulation composition and a jacket composition surrounding the filler material wherein either the insulation composition, the jacket composition, or both comprise at least one antioxidant, wherein the improvement comprises the inclusion in the filler material of a stabilizing mixture comprising at least two antioxidants, selected from at least two members of the group consisting of:
(a) metal dithiocarbamate salts,
(b) amine antioxidants, and
(c) sterically hindered phenolic antioxidants,
wherein the stabilizing mixture is present in the filler material in an amount that is effective for the reduction of the oxidation of the cable filling material, thereby reducing deterioration of the jacket and/or insulation.
U.S. patent application Ser. No. 09/181,287, filed Oct. 28, 1998 discloses a composition comprising:
(A) a thermoplastic resin;
(B) carbon black; and
(C) a stabilizing amount of:
(1) a first stabilizer comprising at least one metal dithiocarbamate salt of the structure
wherein
M is a divalent, trivalent, or tetravalent metal,
X is an integer of from 2 to 4 that equals the valence of M, and
the moiety
is the residue of any secondary amine that will react with carbon disulfide to form a dithiocarbamate; and
(2) a second stabilizer selected from the group consisting of:
(a) at least one amine antioxidant selected from the group consisting of:
(i) a hydrocarbon-substituted diarylamine,
(ii) a reaction product of a diarylamine and an aliphatic ketone,
(iii) an N,N′-hydrocarbon substituted para-phenylenediamine, and
(iv) a polymerized dihydroquinoline, and
(b) at least one sterically hindered phenol.
U.K. Patent 1,356,107 discloses thermoplastic polymer compositions that degrade relatively rapidly on exposure to the environment. The compositions comprise a thermoplastic vinyl polymer or copolymer and at least one nonionic organo-soluble complex of a metal selected from iron, manganese, silver, palladium, molybdenum, chromium, tungsten, or cerium, and a complexing agent, either or both of the complex and complexing agent being an antioxidant, the complex being activatable by light of wavelength less than 330 nm and optionally heat to give a more photo-oxidatively active form of the metal in an amount such as to cause degradation of the polymer composition at the end of its desired life.
European Patent Publication Number 0 080 409 discloses rubber compounds that are useful in molding bags that resist oils at 140 degrees/skbar and contain epichlorohydrin polymers (100 parts), plasticizers (0.5 to 20 parts), reinforcing fillers (1 to 150 parts), metal stearates (0.5 to 7.5 parts), Pb
3
O
4
(0.5 to 7.5 parts), stabilizers (0.5 to 5.5 parts), and vulcanizing agents (0.5 to 5.5 parts). Thus, a mixture of 100 parts polyepichlorohydrin, four parts stearic acid, 2.5 parts Pb
3
O
4
, one part zinc stearate, 2.5 parts N-isopropyl-N′-phenyl-p-phenylenediamine, one part (Bu
2
NCS
2
)
2
Ni, 0.75 part H
2
N(CH
2
)
6
COOH, and 30 parts carbon black was vulcanized 40 minutes at 160 degrees to give a rubber having a tensile strength of 18.7 MPa, elongation 900 percent, 300 percent modulus 6 MPa, and Shore hardness 61; compared with 16.3, 720, 7.6, and 64, respectively, after 24 hours in air at 140 degrees; and 14.3, 500, 9, and 60, respectively, after 24 hours in oil at 140 degrees.
European Patent Publication Number 0 328 788 discloses a composition comprising 100 parts by weight (pbw) of an aromatic vinyl compound-conjugated diene block copolymer and 1.0-5.0 pbw of a mixture of two or more compounds chosen from a dithiocarbamate derivative, a triazine derivative and a polyphenol compound, an adhesive composition containing it and a process for the preparation of said compositions by mixing the components in question.
JP 71037440 discloses the use of thiourea, Irganox RA-565, Soxinol PZ {(Me
2
NCS
2
)
2
Zn}, Irganox RA-1093, and Soxinol M (2-mercaptobenzothiazole) as discoloration stabilizers for polypropylene fibers and films containing a phen
Crompton Corporation
Dilworth Michael P.
Grandinetti Paul
Lee Rip A.
Wu David W.
LandOfFree
Thermoplastic resins in contact with metals or metal salts... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Thermoplastic resins in contact with metals or metal salts..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Thermoplastic resins in contact with metals or metal salts... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3235392