Aliphatic acrylic polyurethane

Aliphatic acrylic polyurethane 41 50 30 min 4 h Two components, excellent color finish, excellent resistant to atmospheric exposure, resistant to mineral oils, paraffin and gasoline... 

High solids aliphatic acrylic polyurethane 60 51-76 Ih 12 h Two components, unlimited recoatability, excellent resistance to chemicals such as water, oil and solvents, tough, flexible and abrasion resistant, excellent hiding power... 

Light cured compositions that contain acrylated polyurethanes have a general reputation of possessing good abrasion resistance, toughness, and flexibility. Furthermore, these properties can be varied by picking either aliphatic polyisocyanates, or aromatic ones, depending upon need. Usually, prepolymers derived from aromatic isocyanates yield better adhesion to the substrate than do the aliphatic ones. 

In the case of topcoats, the two pack acrylic polyurethane almost invariably uses aliphatic isocyanates because of their excellent appearance characteristics and long term durability. The carbon carbon backbone and urethane linkage also impart excellent resistance to chemicals, fuels and environmental conditions. 

Whilst the aliphatic nylons are generally classified as being impact resistant, they are affected by stress concentrators like sharp comers which may lead to brittle failures. Incorporation of mbbers which are not soluble in the nylons and hence form dispersions of rubber droplets in the polyamide matrix but which nevertheless can have some interaction between mbber and polyamide can be most effective. Materials described in the literature include the ethylene-propylene rubbers, ionomers (q.v.), polyurethanes, acrylates and methacrylates, ABS polymers and polyamides from dimer acid. 

The potential of using extrinsic (fluorescent) probes for monitoring the initial stages of oxidation was explored for the photo-oxidation of a UV-cured aliphatic polyurethane-acrylate-based adhesive [68]. The two probes investigated were p-dimethylamino salicylic acid (p-DASA) and 2, 7 -difluorescein (Oregon Green... 

Polyurethane-acrylic coatings with interpenetrating polymer networks (IPNs) were synthesized from a two-component polyurethane (PU) and an unsaturated urethane-modified acrylic copolymer. The two-component PU was prepared from hydroxyethylacrylate-butylmethacrylate copolymer with or without reacting with c-caprolactonc and cured with an aliphatic polyisocyanate. The unsaturated acrylic copolymer was made from the same hydroxy-functional acrylic copolymer modified with isocyanatoethyl methacrylate. IPNs were prepared simultaneously from the two-polymer systems at various ratios. The IPNs were characterized by their mechanical properties and glass transition temperatures. 

PVC can be blended with numerous other polymers to give it better processability and impact resistance. For the manufacture of food contact materials the following polymerizates and/or polymer mixtures from polymers manufactured from the above mentioned starting materials can be used Chlorinated polyolefins blends of styrene and graft copolymers and mixtures of polystyrene with polymerisate blends butadiene-acrylonitrile-copolymer blends (hard rubber) blends of ethylene and propylene, butylene, vinyl ester, and unsaturated aliphatic acids as well as salts and esters plasticizerfrec blends of methacrylic acid esters and acrylic acid esters with monofunctional saturated alcohols (Ci-C18) as well as blends of the esters of methacrylic acid butadiene and styrene as well as polymer blends of acrylic acid butyl ester and vinylpyrrolidone polyurethane manufactured from 1,6-hexamethylene diisocyanate, 1.4-butandiol and aliphatic polyesters from adipic acid and glycols. 

Polyurethane Devthane 359 ICI Devoe Acrylic aliphatic polyurethane... 

TABLE 3.8 Kinetic Data of Chemiluminescence from the UV-Cured Aliphatic Polyurethane-Acrylate-Based Adhesive L350, at 100°C Under Nitrogen, After UV Irradiation... 

CL has been employed to study the mechanism of degradation in polymers such as UV-cured aliphatic polyurethane-acrylate-based adhesives. In styrenic block copolymers, SEBS, the order of the reaction was determined, and the efficiency of antioxidants was evaluated. Also, the relationship between thermooxidation of SEBS and morphology was established, indicating that for these copolymers the oxidation started in the interfacial region. 

Aircraft coatings normally consist of two coats. The topcoat used for civil aircraft is a high-gloss two-pack polyurethane product, cured with aliphatic isocyanates. Single-coat systems based on thermoplastic acrylic resins have been used for military aircraft, but are being replaced by polyurethane topcoats [11.10]. 

Chem. Descrip. Aliphatic polyurethane/acrylic hybrid disp. with n-methyl pyrrolidone cosolv. 

Chem. Descrip. Waterborne aliphatic polyurethane polymer Uses Urethane, film-former for automotive vinyl coatings Features U V-curable no free acrylate monomer forms a hard, high gloss, chem. resist, film when dried and UV cured Properties Translucent dens. 8.80 Ib/gal vise. 150 cps pH 7.8 tens. str. 5300 psi elong. 140% (break) hardness (Sward) 44 VOC 266 g/l 35% solids 9.19% NMP Sancure 853 [Noveon]... 

A large number of compositions containing poly(vinyl alkyl ethers), multifunctional acrylates and benzophenone were irradiated and examined for their pressure-sensitive adhesive properties. Among the components which were found to confer useful properties on the films were the methyl, ethyl, and isobutyl poly(vinyl alkyl ethers) and the multifunctional acrylate derivatives of neopentyl glycol, pentaerythritol, certain epoxidized oils and an aliphatic polyurethane (9). For our present discussion, however, we will focus on the behavior of the poly(vinyl ethyl ether) (PVEE/neopentyl glycol diacrylate (NPGDA) system. 

One-pack or two-pack polyurethane surface coatings, which may sometimes be combined with acrylic resin systems. The one-pack system, which has a long shelf life, is an adduct of resin with polyisocyanate dissolved in a moisture-free solvent. When applied to a surface the film cures and hardens, as moisture in the air reacts with the isocyanate groups in the resin. The two-pack system consists of a polyisocyanate (frequently derived from an aliphatic isocyanate monomer) and a polyol as separate components. Once the two components are mixed, the shelf life is very limited. 

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