Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1995-08-01
1999-06-01
Smith, Jeffrey
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526291, 526302, 526261, C08F22602, C08F22606, C08F21402, C08F21418
Patent
active
059089075
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a monomer containing at least one isocyanate functional group and an unsaturation, to a process of synthesis and to the (co)polymers which are produced thereby. It relates more particularly to compositions which can be used for coatings.
BACKGROUND OF THE INVENTION
In activity involving paints and varnishes, widespread use is made of diisocyanates, especially alkylene diisocyanates (Tolonate) and their derivatives of biuret type or their trimers.
However, two problems remain unsolved at present, namely: and detrimental to the environment; molecules heavier, this being done by oligomerizing the diisocyanates; this solution is not satisfactory because it employs an intricate, and hence expensive, functional group to solve the problem.
OBJECTS AND SUMMARY OF THE INVENTION
This is why one of the objectives of the present invention is to provide a process which makes it possible to obtain a (copolymer or rather a pre(co)polymer which, dispersed in waters may be stable.
Another objective of the present invention is to provide a monomer which allows these products (Tolonate) to be formulated in aqueous phase, with a view to responding to the evolution in techniques and to regulations, tending to make organic solvents disappear.
Another objective of the present invention is to provide a monomer the (co)polymers of which make it possible to obtain aqueous emulsions which have a mass concentration of approximately 40%.
Another objective of the present invention is to provide a monomer the (co)polymers of which make it possible to obtain aqueous emulsions which have good stability (chemical and colloidal) with time.
Another objective of the present invention is to provide a monomer the (co)polymers of which make it possible to obtain aqueous emulsions which give coating layers exhibiting good adhesion to supports (such as resisting standardized peeling on cross-scored coating).
Another objective of the present invention is to provide a monomer the (co)polymers of which make it possible to obtain aqueous emulsions which give coating layers exhibiting good impact strength (rapid deformation: ASTM and AFNOR tests), sufficient flexibility for bending (conical mandrel) and deep drawing (Erichsen deep-drawn test), and high surface hardness (Persoz).
Another objective of the present invention is to provide a monomer the (co)polymers of which make it possible to obtain aqueous emulsions which give coating layers exhibiting good optical properties (gloss).
Another objective of the present invention is to provide a monomer the (co)polymers of which make it possible to obtain aqueous emulsions which give coating layers exhibiting good resistance to solvents (ketons etc.).
These objectives and others which will appear later are met by means of a monomer which corresponds to the following formula: (Formula 1) denote a hydrogen or a group chosen from: aralkyls, aryls, alkoxys and silyls; carbonyl group, such as alkoxycarbonyl hydroxycarbonyl (carboxylic acid) or aminocarbonyl (amide); (advantageously omega, omega prime) hydrocarbon radical of 2 to 12 carbon atoms, advantageously of formula: and R.sub.4 denoting a hydrogen or a group chosen from: especially alkyls, aryls, aralkyls and silyls; preferably light, chalcogen atoms, sulphur or advantageously oxygen, each chalcogen atom being preferably separated by at least two carbon atoms as !.sub.m --), preferably not very branched, preferably with free .omega.,.omega.' valencies where z is egual to 0 or, preferably, to 1; between 2 and 7 (closed intervals advantageously between 2 (not including this value) and 4, and n being equal to p+q; between 1.5 and 2.5 (closed intervals); and not exceeding 3 (semiopen, semiclosed interval), preferably not exceeding 2 (semiopen, semiclosed interval).
The blocking agents most commonly employed are those mentioned by M. Wicks in his "blocked isocyanates" paper.
In general, and for obvious practical reasons, the values of p and of q are average, or statistical, values and, in this case,
REFERENCES:
patent: 4485226 (1984-11-01), Noll et al.
Desbois Michel
Reeb Roland
Richard Joel
Truchet Francoise
Cheng Wu C.
Rhone-Poulenc Chimie
Smith Jeffrey
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