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
1995-04-07
1997-08-26
Szekely, Peter A.
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...
524555, 526317, 4273935, 427482, 427483, C08L 3900, C08F 1228, B05D 302, B05B 514
Patent
active
056612125
DESCRIPTION:
BRIEF SUMMARY
This invention relates to coating compositions and in particular to aqueous coating compositions containing certain olefinic addition polymers and to certain novel olefinic addition polymers for use therein.
The provision of polymeric film coatings for use on a variety of substrates, usually for protective and/or decorative purposes, is well known. Film coatings which are intended for use in moist or humid conditions, such as for outdoor use or in kitchens or bathrooms or in applications where resistance to repeated washing is a requirement, must have good wet adhesion i.e. the polymeric film coating must retain its adhesive bond to the substrate under damp conditions.
Coating compositions are known, from EP 0 341 886, which comprise olefinic addition polymers having chain-pendant primary and/or secondary amine and chain-pendant carbonyl functionalites but these suffer from the disadvantage that they cause strong yellowing of not only overcoated alkyd-containing films but of any alkyd-containing films in the vicinity. Polymers which incorporate tertiary amine monomers such as dimethylamino ethylmethacrylate (DMAEMA) are known from EP 0290777 and have been used in coating compositions and provide moderate wet adhesion without noticeable alkyd yellowing at levels of 3-7% but higher levels of up to 15% are required to match the performance of market leading compositions. However, at these higher levels the film forming properties of the composition are inadequate requiring the addition of plasticisers, which causes total loss of adhesion, or requiring the addition of solvents which produces an environmentally undesirable increase in the volatile organics content.
We have now found that polymeric films which have good wet adhesion properties and do not cause yellowing in adjacent or nearby alkyd-containing coatings and which additionally have good antiblocking properties and low minimum film forming temperatures (MFFT) may be obtained from polymer compositions which have tertiary amino and acetoacetyl functionality.
According to the present invention there is provided a coating composition comprising a liquid carrier-based dispersion of at least one olefinic addition polymer, said dispersion of polymer(s) providing polymer bound tertiary amino groups and polymer bound acetoacetyl groups.
The dispersion may be a dispersion of said polymer(s) in at least one organic liquid, in water, or in a combination of water and at least one organic liquid. Suitable organic liquids may be selected from glycols such as ethylene glycol, propylene glycol and butylene glycol, alkoxylated glycols such as propoxylated ethyleneglycol and propylene glycol, and ethoxylated butylene glycol, aliphatic hydrocarbons such as hexane, aromatic hydrocarbons such as xylene, esters such as ethyl acetate and ethyl butyrate, ethers such as diethylether and tetrahydrofuran, alcohols such as propanol and butanol, ketones such as methylisobutylketone, and nitroalkanes such as nitropropane.
The dispersion of said polymer(s) is preferably an aqueous dispersion and for the purposes of the present invention the term `aqueous dispersion` means a dispersion of the olefinic addition polymer(s) in a liquid carrier in which water is the principal component at equal to or greater than 50% by weight of the liquid carrier, and preferably at equal to or greater than 80% by weight of the liquid carrier. Minor amounts of organic liquids may optionally be present. The aqueous dispersion is preferably an aqueous latex of the olefinic addition polymer(s). The aqueous dispersion may optionally further comprise materials which aid film coalescence, examples of which are given in the list of organic liquids described above.
By an olefinic addition polymer is meant an addition polymer derived from the polymerisation of one or more olefinically unsaturated monomers.
The dispersion of polymer(s) in the composition of the invention provides a polymer system having polymer bound tertiary amino groups and polymer bound acetoacetyl groups. Such amino and acetoacetyl groups ca
REFERENCES:
patent: 3985698 (1976-10-01), Matsudaira
patent: 4166882 (1979-09-01), Das et al.
patent: 4418175 (1983-11-01), Probst et al.
patent: 4760110 (1988-07-01), Das
patent: 4988762 (1991-01-01), Overbeek et al.
patent: 5002998 (1991-03-01), Carey et al.
Ronald W.Kreis, Ph.D, "Development of a Ureido Functional Monomer for Promoting Wet Adhesion in Latex Paints", University of Southern Mississippi, 1988, pp. 222-242.
Goos Hendricus Cornelis
Lear Peter
Overbeek Gerardus Cornelis
Stevens Emile Johannes Maria
Szekely Peter A.
Zeneca Resins BV
LandOfFree
Method of providing a coating composition on alkyd-coating and t does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of providing a coating composition on alkyd-coating and t, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of providing a coating composition on alkyd-coating and t will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1989101