Pva Polyvinyl Acetate Beads

SIVA CHEMICAL INDUSTRIES
(Fact.) Plot No: 26, The Vasai, The Taluka Indl. Co-Op. Estate Ltd; Village: Gavraipada, Vasai Road (East),Dist:Thana 401208. Tele.No: 95 250 2 455237 / Fax: 95 250 2 455427.

Vinac
Polyvinyl Acetate Beads
Table 1 Typical properties (Specification will be furnished on request)
GRADES

B – 15
Molar viscosity Molecular Weight %) Acid (as actic) Max) Softening Point(C) Form Density 20C Specific Heat Burning rate Tensile Strength Water resistence 10.0 – 12.0 90,000 1.5 0.1 130 =10

B – 25
15.0 – 18.0 1,40,000 1.5 0.1 155 =10

B – 100
60.75 5,00,000 2.0 0.1 ---

Spherical granules , all pass 8 mesh Screen 1.19 Grams/cc 0.39 cal/gram/C Slow Up to 5000 psi Prolongeed immersion results in sight water absorption , Particularly in low viscosity grades Theviscosities of the B 15 , B – 25 & ASB – 516 beads are determinded in a No 200 ostwald - fensek Tube at 20 C . The viscosity of the B – 100 beads is determined by a Brookfield Viscometer , Model RVO at 20 C with a No. 2 Spindle at 20 r.P.M. To make the determinations, the B – grades are dissolved in toluene.

General Vinac resins are small, glass like beads of high purity poly – vinyl createused in laminating label & hot melt adhesives pigmented & grease – proof paper coating overprint varnishes industrial lacquers & coating printing inks textile & finishes. & numerous other applications. They are odorless, testless & nontoxic are resistant to attack by weak acids alkalies & salts, But are soluble in many organic solvents. Being thermoplastics VINAC heads will soften with increasingtemperature. Their heat stability is good below 100 C

slight discoloration occurs above 150 C but decomposition does not start until 200 – 250 C. VINAC resins are produced in a range of molecular weights As with other resins. Physical properties such as solution viscosity tensile strength & softening point increase with increasing molecular weight. VINAC ASB – 516 polyvinyl acetate resin ismodified to obtain solubility in alkaline systems while still retaining the valuable properties of polyvinyl acetate. Firms made from VINAC resins are clear, colorless, greaseproof & heat sealable. VINAC resins are generally modified with plasticizers to obtain the flexibility desired & in many uses. They are also combined with a wide variety of other resins with which they are compatible. Applicationsof VINAC polyvinyl Acetate Beads Adhesives VINAC resins are widely used in the adhesives industry. VINAC polyvinyl acetate is an excellent adhesives for a variety of porous & nonporous surfaces, including paper, cloth , cellophane, board, cork, metal, leather, wood, china, glass & many plastic materials. VINAC prepared into two forms – hot melt & solvent adhesives.  Hot Melt Adhesives Hot MeltAdhesives are solid materials which become sufficiently fluid at elevated temperature to be applied to bonding surfaces & solidify immediately afterwards. Neither bonding surface has to be porous because no solvent evaporation is involved The application speed & fast set are important advantages of hot melts . also the absence of solvents from hot melt greatly reduce toxicity & fire hazards. Atypical hot melt formulation contains 30 – 50% VINAC polyvinyl acetate (low viscosity) resin as the primary adhesives component. 23 – 35% co – resin or extender resin to increase fluidity at the application temperature & reduce cost ,& 25-35% plasticsizer(s) to increase flexibility & adhesion 7 reduce cost . VINAC ASB- 516 resin is particularly recommended for hot melts in paper & board ,& because itpermits recovery of scrap paper

Two main uses of hot melts are packaging adhesives & book binding adhesives are usually applied at about 162 C in packaging application & hot melt coating , the temperature can range from 82C to 162 C . The pot life of a hot melt at 162 C generally does not exceed eight hours. But with the continual addition of ingredients. In definitely. It is often necessary...