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...
Reexamination Certificate
2002-03-08
2004-03-02
Wu, David W. (Department: 1713)
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...
C524S560000, C524S561000, C524S562000, C524S601000, C524S605000, C524S764000, C528S272000, C528S290000, C528S295000, C528S302000, C528S308000
Reexamination Certificate
active
06699931
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to modified alkyd polymers, and to compositions made from such polymers, in which the alkyd polymers are modified with polyol-containing latex compositions and/or diol-containing latex compositions. The invention further relates to compositions prepared from such modified alkyd compositions.
BACKGROUND OF THE INVENTION
Coatings based on alkyds are known to have good application and wetting properties. Coatings based on acrylic (latex) polymers generally have superior film properties such as durability, weathering, and chemical resistance. Accordingly, alkyd compositions modified with latex compositions would be useful to provide combinations of the specific advantages of the two coating types.
One way to accomplish this objective would be to combine in a physical blend an alkyd composition with a latex polymer composition. However, alkyd polymers and latex polymers are not readily compatible, due to their distinctly different chemical structures and molecular weights. Accordingly, it has been determined that physical blends of alkyd polymers and latex polymers often separate, either in the blended composition itself or after the composition has been applied to a substrate. Such separation is due, in part, to the difference in molecular weights of the two materials. Alkyds are generally prepared by polycondensation and typically have molecular weights below 10,000, while latex polymers are addition polymers and typically have molecular weights over 100,000. A blend may be prepared by using a latex polymer having a lower molecular weight. However, this will generally result in poorer coating performance.
Modification of alkyd polymers has also been attempted by polymerizing latex monomers in the presence of alkyd dispersions, as disclosed in U.S. Pat. No. 4,451,596 and European Patent Application No. 0 555 903. Alkyd polymers prepared from these methods contain grafted moieties that are derived from the latex monomers. Coating compositions based on these materials generally have poor reactivity toward oxidative cure due to the presence of low and insufficient amounts of unsaturated groups in the fully formed latex grafted alkyd polymer. The unsaturated moieties present in alkyd polymers are typically consumed during the free radical polymerization of the latex monomers, and are therefore not available for oxidative cure in the coatings compositions. Furthermore, since the latex aspect of the alkyd polymer is derived from a monomer, as opposed to a latex polymer, the alkyd polymer cannot completely incorporate the beneficial aspects of the latex polymer due to the relatively low molecular weight of the grafted species.
In light of the above, it would be desirable to obtain a latex modified alkyd composition in which the modified alkyd composition provides the benefits of both alkyd polymers and latex polymers, in a stable composition.
SUMMARY OF THE INVENTION
The invention provides modified alkyd polymers, and compositions thereof, in which the alkyd polymers are modified by incorporation of polyol and/or diol-containing latex compositions. In a further aspect, the invention provides methods of making such compositions. In a still further aspect, the invention relates to compositions formed from such modified alkyd compositions.
Advantages of the invention will be set forth in the description that follows, and further advantages will be apparent from the description, or may be learned by practice of the invention. The advantages of the invention will be realized and attained by means of the elements and combinations particularly pointed out in the appended claims. However, both the foregoing general description and the following detailed description are exemplary and explanatory only, and are not restrictive of the invention, as claimed.
DETAILED DESCRIPTION OF THE INVENTION
The present invention may be understood more readily by reference to the following detailed description of the invention, and to the Examples included therein.
Before the present compositions of matter and methods are disclosed and described, it is to be understood that this invention is not limited to specific synthetic methods or to particular formulations, and, as such, may vary from the disclosure. It is also to be understood that the terminology used is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the invention.
The singular forms a, an and the include plural referents, unless the context clearly dictates otherwise.
Optional or optionally means that the subsequently described event or circumstances may or may not occur. The description includes instances where the event or circumstance occurs, and instances where it does not occur.
The polymeric particles herein may be produced via emulsion polymerization, dispersion polymerization, or supension polymerization.
Diol is a synonym for glycol or dihydric alcohol. Polyol is a polyhydric alcohol containing three or more hydroxyl groups.
Ranges may be expressed herein as from about one particular value, and/or to about another particular value. When such a range is expressed, it is to be understood that another embodiment is from the one particular value and/or to the other particular value.
Throughout this application, where publications are referenced, the disclosures of these publications in their entireties are intended to be incorporated by reference into this application, in order to more fully describe the state of the art to which the invention pertains.
The present invention relates to modified alkyd polymers in which the modification is accomplished by including a polyol-containing latex composition in an alkyd polymerization reaction. The polyol-containing latex composition may, in some aspects, also include some diol. Additionally, the invention relates to the addition of a diol-containing latex composition to an alkyd polymerization reaction. The diol-containing latex composition may, in some aspects, also include some polyol.
The latex compositions utilized herein comprise a latex polymer and a continuous phase, the continuous phase comprising a polyol and/or a diol component. As used herein, the latex composition includes latexes comprised of core shell and/or non-core shell latex polymers.
In one aspect, this invention concerns the preparation of a polyol-containing latex composition by emulsion polymerization, wherein the continuous phase comprises a polyol component, and wherein the composition may optionally comprise at least some diol.
The continuous phase of the polyol-containing latex compositions utilized in the alkyd polymerization reactions of the invention may contain one or more polyol components. Polyol components used in the continuous phase include, but are not limited to, one or more of glycerol, trimethylolpropane, trimethyolethane, pentaerythritol, 1,2,6-hexanetriol, sorbitol, 1,1,4,4-tetrakis(hydroxymethyl)cyclohexane, tris-(hydroxyethyl)isocyanurate, tripentaerythritol, and dipentaerythritol. In addition to low molecular weight polyols, higher molecular weight polyols (MW 400-3000), such as triols derived by condensing alkylene oxides having from 2 to 3 carbons, e.g., ethylene oxide or propylene oxide, with polyol initiators, having from 3 to 6 carbons, e.g., glycerol, can also be used.
In one aspect, the polyol component is present in an amount of from 10 to 100 weight %, based on the total weight of the continuous phase; still further, from 40 to 100 weight %, based on the total weight of the continuous phase; still further, from 75 to 100 weight %, based on the total weight of the continuous phase; still further, from 90 to 100 weight %, based on the total weight of the continuous phase; and, still further, 100 weight %, based on the total weight of this continuous phase. In a further aspect, the polyol-containing continuous phase consists essentially of the polyol component. Yet still further, the polyol component may be any of 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 99, or 100 w
Jones Allan Scott
Kuo Thauming
Moncier John David
Murray David Logan
Sharma Mahendra Kumar
Carrier Michael K.
Eastman Chemical Company
Graves, Jr. Bernard J.
Sastri Satya
Wu David W.
LandOfFree
Modified alkyd compositions comprising diol latex... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Modified alkyd compositions comprising diol latex..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Modified alkyd compositions comprising diol latex... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3222392