Polyester acrylate unsaturated

Products Pigments/dispersions, photoinitiators/sensitizers, acrylate monomers, vinyl ethers, polyols/glycols, epoxy acrylates, polyester acrylates, unsaturated polyesters, urethane acrylates... 

IPNs are found in many applications though this is not always recognised. For example conventional crosslinked polyester resins, where the polyester is unsaturated and crosslinks are formed by copolymerisation with styrene, is a material which falls within the definition of an interpenetrating polymer network. Experimental polymers for use as surface coatings have also been prepared from IPNs, such as epoxy-urethane-acrylic networks, and have been found to have promising properties. 

Photoirradiation of this polyester in the near UV induces its crosslinking through interchain cycloaddition of the acrylic unsaturations. 

Solid urethane and polyester acrylates may be used as main components of radiation curable powders. Together with suitable unsaturated polyesters, powders are formed, which give low-film-flow temperatures and allow separating of film formation from curing. This technology has been used successfully in powder coating of wood and plastics. ... 

Acrylics, unsaturated polyesters and other monomer-based adhesives containing ethy-lenic unsaturation, cure by formation of free peroxide radicals formed with transition metal ion donators such as cobalt, iron, copper and nickel. In engineering applications the presence of transition metals on surfaces sees them act as initiators by forming the free peroxide radicals from the added peroxide compound(s). The base monomers usually contain inhibitors such as phenols or other materials classed as peroxide stabilisers to... 

Binders in coatings include polyvinyl acetate and copolymers, polyvinyl butyral, polyesters, acrylic polymers, epoxies and polyurethanes (see Ethylene-vinyl acetate copolymers. Acrylic adhesives, Epoxide adhesives and Polyurethane), polyvinyl chloride, polyvinylidene fluoride and aUcyds (oxygen-convertible media containing polyol esters of long-chain unsaturated acids). All these potential film-formers can adhere through dispersion forces, (which are probably weak). Many binders, however, also contain... 

The thermal stability of composites containing natural fibres may also depend on the nature of the matrix. In the case of composites containing unsaturated polyester or unsaturated polyester modified with acrylic acid reinforced with jute fibres it was shown that the composites with modified polyester matrix were more resistant to temperature than the ones with unmodified polyester matrix. The reason for this enhanced thermal stability was the presence of acrylic acid as modifier [45]. 

The unsaturated polyester coatings of the type earlier described are nowadays mostly replaced with other resin types of lower viscosity. Instead of an unsaturated polyester resin, lower molecular weight polymers may be used, often called acrylic oligomers. These oligomers are for example the reaction products of acrylic acid and end groups in epoxy resins (epoxy acrylates) and in saturated polyesters (polyester acrylates). The linking reactions are shown diagrammatically ... 

Recommended for polymers PVC (flexible and rigid), PC, ABS, HIPS, PS, acrylics, unsaturated polyesters ... 

Silane coupling agents are widely used in thermoset systems, especially unsaturated polyesters, acrylics and epoxies. The silanes most commonly used are vinyl, methacryl, epoxy and amino. Among the fillers commonly treated are various silicas and silicates and aluminium hydroxide. The latter is particularly widely used for its flame retardancy. The in situ treatment method is frequently used with thermosets. 

The synthesis of polyester acrylates (Scheme 16.29) is a batch process as well. In contrast to the preparation of epoxy acrylates this reaction is performed in a solvent, and generally add-catalyzed. The preparations differ from the synthesis of unsaturated polyesters (see Section 16.7), mainly because (meth)acrylates have very reactive double bonds, which can easily homopolymerize. Consequently high reaction temperatures cannot be used. Generally the maximum temperature that... 

Unsaturated polyester-acrylic acid mixtures have been polymerized in situ on polyester fibers to provide graft polymer sizes that are easily removed by neutralization with a base. This type of combination has also been claimed for producing photopolymerized printing plates.These two patents give examples of how unsaturated polyesters may be mixed and polymerized with unconventional reactive diluent monomers to meet new special needs. 

Unsaturation (e.g., vinyl or methacrylic) Unsaturated polyesters, acrylics, peroxide crosslinked elastomers... 

Methacrylate 3-Methacryloxypropyltrimethoxysilane Unsaturated polyesters, acrylics, EVA, polyolefin... 

C.-J. You, J.-G. Xu, S. Xi, X.-X. Duan, J. Shen, and D.-M. Jia. Properties and morphology of unsaturated polyester/acrylate-terminated polyurethane/organo-montmorillonite nanocomposites. Chinese Journal of Polymer Science, 235 (2005), 471-478. 

Multifunctional acrylates, unsaturated low-viscosity acrylic polyesters, and unsaturated polyurethanes or their mixtures only permit the formulation of solvent-free, photoreactive A-PSAs with desired viscosity (Figure 4.10). Data presented here is taken from a study, which, was done with three various UV-reactive diluents the selection of reactive diluents was made based on their solubility, photoreactivity, UV crosslinkability, and, if available, glass-transition temperature contribution. 

Broad-band benzotriazole UV absorber recommended for acrylic, unsaturated polyester, polycarbonate, styrenes, and vinyls. 

Peioxydicaibonates are efficient polymerization initiators for most vinyl monomer polymerizations, especially for monomers such as acrylates, ethylene, and vinyl chloride. They are particularly good initiators for less reactive monomers such as those containing aHyl groups. They are also effective for curing of unsaturated polyester mol ding resins. 

Itaconic acid is a specialty monomer that affords performance advantages to certain polymeric coatings (qv) (see Polyesters, unsaturated). Emulsion stabihty, flow properties of the formulated coating, and adhesion to substrates are improved by the acid. Acrylonitrile fibers with low levels of the acid comonomer exhibit improved dye receptivity which allows mote efficient dyeing to deeper shades (see Acrylonitrile polymers Fibers, acrylic) (10,11). Itaconic acid has also been incorporated in PAN precursors of carbon and graphite fibers (qv) and into ethylene ionomers (qv) (12). 

---