GB2096159A - Improvements in and relating to polymeric coatings - Google Patents

Improvements in and relating to polymeric coatings Download PDF

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Publication number
GB2096159A
GB2096159A GB8110399A GB8110399A GB2096159A GB 2096159 A GB2096159 A GB 2096159A GB 8110399 A GB8110399 A GB 8110399A GB 8110399 A GB8110399 A GB 8110399A GB 2096159 A GB2096159 A GB 2096159A
Authority
GB
United Kingdom
Prior art keywords
composition
antioxidant
polymer
polybutylene
olefinic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB8110399A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Plascoat Systems Ltd
Original Assignee
Plascoat UK Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Plascoat UK Ltd filed Critical Plascoat UK Ltd
Priority to GB8110399A priority Critical patent/GB2096159A/en
Priority to FR8205547A priority patent/FR2503175A1/en
Publication of GB2096159A publication Critical patent/GB2096159A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/13—Phenols; Phenolates
    • C08K5/134—Phenols containing ester groups
    • C08K5/1345—Carboxylic esters of phenolcarboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/13—Phenols; Phenolates
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D123/00—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers
    • C09D123/02—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment

Abstract

A tough, chemical resistant coating, for example for the metal mesh or wire of a washing machine basket is composed of an olefinic polymer containing a sterically hindered phenolic antioxidant present in the range 1-3% by weight.

Description

SPECIFICATION Improvements in and relating to polymeric coatings This invention concerns improvements in and relating to polymeric coatings for applications to metal surfaces, particularly in situations where a tough, chemical resistant coating is required.
In particular, the invention relates to an olefinic polymer based coating for application to, for example, the metal mesh or wire of a washing machine basket, which is commonly subject to sustained periods of high temperature, moisture and abrasion.
According to the present invention there is provided a composition of matter suitable for coating a metal substrate, the composition comprising an olefinic polymer containing at least 1% of an antioxidant.
The antioxidant is preferably a sterically hindered phenolic antioxidant.
The antioxidant is preferably pentaeritrityltetrakis-(3(3.5-di-t-butyl-4-hydroxyphenyl)) propionate, hereinafter referred to as PETP, made by Ciba-Geigy AG and known commercially under the trade name Irganox 1010.
The antioxidant is preferably present in the range 13%.
The olefinic polymer is preferably a polypropylene homo- or co-polymer which contains up to about 70% by weight of modifying polymer such as polybutylene, preferably a polybutylene with a melt index in the range 7-20. Such modification unexpectedly eliminates porosity defects which arise if polypropylene is used on its own.
The composition may further contain an olefinic polymer modified to enhance the adherence of the composition to the metal substrate by the inclusion of reactive groupings.
It is found that a level of 13% of antioxidant compared with about 0.1% hitherto used gives an enhanced degree of toughness which would not be predicted from such an increase in the level of antioxidant.
The invention will now be described by way of example only with reference to the following nonlimiting embodiment.
A coating composition was made up according to the formulation: % by weight Polypropylene homopolymer 55.1 (melt index 30) Polybutylene (melt index 20) 36.7 Propylene/acrylic 6.4 acid copolymer Anti-oxidant stabilizer 1.8 (PETP) The propylene/acrylic acid copolymer was incorporated in order to enhance the adhesive qualities of the coating when applied to a metal substrate such as steel.
A washing machine basket made of steel wire was coated with the composition, which was found to possess freedom from porosity, toughness and resistance to heat and moisture superior to those which would be expected from an unmodified polypropylene containing the normal 0.1% of antioxidant. A pure polypropylene coating suffers from brittleness and porosity defects. The brittleness is greatly ameliorated by the high level of antioxidant according to the invention. The polybutylene further improves the toughness and gives the freedom from porosity.
Olefinic polymers other than polypropylene, such as polyethylene or olefinic copolymers may be used as the base polymer. Similarly, other olefinic polymers may be used in place of the polybutylene modifying polymer.
The composition additionally may contain a quantity of pigmentary or other fillers.
1. A composition of matter suitable for coating a metal substrate, the composition comprising an olefinic polymer containing at least 1% by weight of an antioxidant.
2. The composition claimed in claim 1 , wherein the antioxidant is a sterically hindered phenolic antioxidant.
3. The composition claimed in claim 2, wherein the antioxidant is pentaeritrityl-tetrakis-(3(3.5-dit-butyl-4-hydroxyphenyl)) propionate.
4. The composition claimed in claim 1, 2 or 3, wherein the antioxidant is present in the range 13% by weight.
5. The composition claimed in any preceding claim, wherein the olefinic polymer is a polypropylene homo- or co-polymer which contains up to about 70% by weight of modifying polymer.
6. The composition claimed in claim 5, wherein the modifying polymer is polybutylene.
7. The composition claimed in claim 6, wherein the polybutylene is a polybutylene with a melt index in the range 7-20.
8. The composition claimed in any preceding claim, further containing an olefinic polymer modified to enhance the adherence of the composition to the metal substrate by the inclusion of reactive groupings.
9. The composition claimed in claim 8, wherein the modified olefinic polymer is a propylene/acrylic acid copolymer.
1 0. A composition of matter substantially as hereinbefore described.
11. A metal substrate coated with the
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (13)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Improvements in and relating to polymeric coatings This invention concerns improvements in and relating to polymeric coatings for applications to metal surfaces, particularly in situations where a tough, chemical resistant coating is required. In particular, the invention relates to an olefinic polymer based coating for application to, for example, the metal mesh or wire of a washing machine basket, which is commonly subject to sustained periods of high temperature, moisture and abrasion. According to the present invention there is provided a composition of matter suitable for coating a metal substrate, the composition comprising an olefinic polymer containing at least 1% of an antioxidant. The antioxidant is preferably a sterically hindered phenolic antioxidant. The antioxidant is preferably pentaeritrityltetrakis-(3(3.5-di-t-butyl-4-hydroxyphenyl)) propionate, hereinafter referred to as PETP, made by Ciba-Geigy AG and known commercially under the trade name Irganox 1010. The antioxidant is preferably present in the range 13%. The olefinic polymer is preferably a polypropylene homo- or co-polymer which contains up to about 70% by weight of modifying polymer such as polybutylene, preferably a polybutylene with a melt index in the range 7-20. Such modification unexpectedly eliminates porosity defects which arise if polypropylene is used on its own. The composition may further contain an olefinic polymer modified to enhance the adherence of the composition to the metal substrate by the inclusion of reactive groupings. It is found that a level of 13% of antioxidant compared with about 0.1% hitherto used gives an enhanced degree of toughness which would not be predicted from such an increase in the level of antioxidant. The invention will now be described by way of example only with reference to the following nonlimiting embodiment. A coating composition was made up according to the formulation: % by weight Polypropylene homopolymer 55.1 (melt index 30) Polybutylene (melt index 20) 36.7 Propylene/acrylic 6.4 acid copolymer Anti-oxidant stabilizer 1.8 (PETP) The propylene/acrylic acid copolymer was incorporated in order to enhance the adhesive qualities of the coating when applied to a metal substrate such as steel. A washing machine basket made of steel wire was coated with the composition, which was found to possess freedom from porosity, toughness and resistance to heat and moisture superior to those which would be expected from an unmodified polypropylene containing the normal 0.1% of antioxidant. A pure polypropylene coating suffers from brittleness and porosity defects. The brittleness is greatly ameliorated by the high level of antioxidant according to the invention. The polybutylene further improves the toughness and gives the freedom from porosity. Olefinic polymers other than polypropylene, such as polyethylene or olefinic copolymers may be used as the base polymer. Similarly, other olefinic polymers may be used in place of the polybutylene modifying polymer. The composition additionally may contain a quantity of pigmentary or other fillers. CLAIMS
1. A composition of matter suitable for coating a metal substrate, the composition comprising an olefinic polymer containing at least 1% by weight of an antioxidant.
2. The composition claimed in claim 1 , wherein the antioxidant is a sterically hindered phenolic antioxidant.
3. The composition claimed in claim 2, wherein the antioxidant is pentaeritrityl-tetrakis-(3(3.5-dit-butyl-4-hydroxyphenyl)) propionate.
4. The composition claimed in claim 1, 2 or 3, wherein the antioxidant is present in the range 13% by weight.
5. The composition claimed in any preceding claim, wherein the olefinic polymer is a polypropylene homo- or co-polymer which contains up to about 70% by weight of modifying polymer.
6. The composition claimed in claim 5, wherein the modifying polymer is polybutylene.
7. The composition claimed in claim 6, wherein the polybutylene is a polybutylene with a melt index in the range 7-20.
8. The composition claimed in any preceding claim, further containing an olefinic polymer modified to enhance the adherence of the composition to the metal substrate by the inclusion of reactive groupings.
9. The composition claimed in claim 8, wherein the modified olefinic polymer is a propylene/acrylic acid copolymer.
1 0. A composition of matter substantially as hereinbefore described.
11. A metal substrate coated with the composition claimed in any preceding claim.
12. A substrate as claimed in claim 11, which comprises the metal mesh or wirework of a washing machine basket.
13. A dish washing machine provided with a basket as claimed in claim 1 2.
GB8110399A 1981-04-02 1981-04-02 Improvements in and relating to polymeric coatings Withdrawn GB2096159A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB8110399A GB2096159A (en) 1981-04-02 1981-04-02 Improvements in and relating to polymeric coatings
FR8205547A FR2503175A1 (en) 1981-04-02 1982-03-31 POLYMERIC COATING FOR METAL PROTECTION

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8110399A GB2096159A (en) 1981-04-02 1981-04-02 Improvements in and relating to polymeric coatings

Publications (1)

Publication Number Publication Date
GB2096159A true GB2096159A (en) 1982-10-13

Family

ID=10520870

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8110399A Withdrawn GB2096159A (en) 1981-04-02 1981-04-02 Improvements in and relating to polymeric coatings

Country Status (2)

Country Link
FR (1) FR2503175A1 (en)
GB (1) GB2096159A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10221327B2 (en) 2015-03-25 2019-03-05 Dow Global Technologies Llc Water borne polyolefin dispersion coatings, and methods of making

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1201784B (en) * 1986-11-28 1989-02-02 Zanussi Zeltron Inst PROCEDURE FOR THE MANUFACTURE OF BASKETS FOR DISHWASHER MACHINES AND BASKETS OBTAINED BY SUCH PROCEDURE

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10221327B2 (en) 2015-03-25 2019-03-05 Dow Global Technologies Llc Water borne polyolefin dispersion coatings, and methods of making

Also Published As

Publication number Publication date
FR2503175A1 (en) 1982-10-08

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)