Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1994-10-21
1997-08-12
Morgan, Kriellion S.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524458, 524504, 428480, 428522, C08K 320, B32B 2706
Patent
active
056566859
DESCRIPTION:
BRIEF SUMMARY
This is a 371 of PCT/GB/93/00969 filed May 12, 1993.
The present invention relates to an aqueous crosslinkable coating composition containing a certain carboxyl-functional copolymer derived from the polymerisation of two or more olefinically unsaturated monomers.
The provision of polymeric coatings on a variety of substrates, e.g. for protective, decorative, adhesive or sealant purposes, is a well established field of technology. It is well known to improve the performance of such coatings by causing them to become crosslinked (cured) during and/or after coating formation from the composition and various crosslinkable aqueous polymer compositions for achieving such an objective have been used or proposed.
One such type of crosslinkable composition incorporates an aqueous dispersion of a carboxyl-functional polymer made from two or more olefinically unsaturated monomers, such a composition including a carboxyl-reactive material that will effect a crosslinking reaction involving the carboxyl groups of the polymer and the material during and/or after film formation. For example aqueous crosslinkable compositions which include carboxyl-functional polymers and polyepoxy compounds or certain multivalent metal compounds have been proposed, in which crosslinking occurs respectively by reaction of the carboxyl groups with epoxide groups of the polyepoxy compound or by the carboxyl groups taking part in ionic crosslinking with metal ions from the metal compound. Also proposed have been aqueous crosslinkable compositions which include carboxyl-functional polymers and polymers having hydroxyl groups wherein crosslinking occurs by an esterification reaction involving the carboxyl and hydroxyl groups.
The source of the carboxyl groups in the polymers of such crosslinkable compositions has hitherto been widely-used .alpha.-.beta. olefinically unsaturated acids such as, in particular, acrylic acid, methacrylic acid and (sometimes) itaconic acid, the acid(s) being used as one of the monomers in the polymerisation so as to provide polymerised units thereof in the copolymer.
We have now discovered that by selecting certain olefinically unsaturated carboxylic acid-containing monomers as the source of at least part of the carboxyl group content of the polymer a coating composition of significantly improved performance is unexpectedly achieved.
According to be present invention there is provided an aqueous crosslinkable coating composition comprising an aqueous dispersion of:
(A) at least one copolymer, said copolymer being obtainable or derived from the addition polymerisation of 2 or more olefinically unsaturated monomers and bearing lateral carboxyl groups which are provided at least in part by polymerised units in said copolymer of a monomer of formula: Q is a non carboxyl-containing spacer group providing a spacer chain of at least 3 (preferably at least 4) atoms, said monomer of Formula (1) preferably being .beta.-carboxy ethyl acrylate,
(B) at least one carboxyl-reactive material for providing crosslinking during and/or after coating formation from the composition in which the polymer-bound carboxyl groups provided by the monomer of Formula (1) take part, and wherein the components (A) and (B) are provided by different and/or the same substance(s).
There is also provided according to the invention a method of coating a substrate which comprises applying thereto an aqueous crosslinkable composition defined above and allowing or causing the aqueous phase to becomed removed to form a coating on the substrate.
There is further provided according to the invention a crosslinked coating formed from an aqueous crosslinkable coating composition as defined above.
There is further provided according to the invention a coated substrate, wherein the coating on said substrate has been derived or is obtainable from an aqueous crosslinkable coating composition as defined above.
By an aqueous dispersion of the components (A) and (B) is meant herein a dispersion of the components in a liquid carrier medium of which water in the principal
REFERENCES:
patent: 4554212 (1985-11-01), Diefenbach et al.
patent: 4739004 (1988-04-01), Sekmakas et al.
patent: 4806590 (1989-02-01), Padget et al.
Carey John Gerard
Padget John Christopher
Satgurunathan Rajasingham
Morgan Kriellion S.
Zeneca Limited
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