Patent ID: 8889782
Filing Date: 2014-11-18
Classification: C08G,C08J,C08K,C08L,C09D

Abstract:
1. A composition for making a peelable protective film, prepared by mixing a vinyl chloride-vinyl acetate copolymer having a content of vinyl acetate with high-molecular-weight emulsified, polymerized PVC powder and low-molecular-weight emulsified, polymerized PVC powder and plasticizers without using any solvents, wherein the composition has a thixotropic index (T.I.) ranging between 2.00 and 2.20 as measured by a rotational viscometer under a setting of viscosity at 0.5 rpm/viscosity at 2.5 rpm, and comprises the following components by weight of the composition: a) a vinyl chloride-vinyl acetate copolymer, having a K-value of between 69 and 71, and being present in an amount ranging between 10 wt % and 65 wt %, wherein the content of vinyl acetate ranges between 1.0% and 12.5%; b) a high-molecular-weight emulsified, polymerized PVC powder, having an average degree of polymerization ranging between 1650 and 1850 and a K-value of between 77.5 and 81, and being present in an amount ranging between 3 wt % and 20 wt %; c) a low-molecular-weight emulsified, polymerized PVC powder, having an average degree of polymerization ranging between 1350 and 1550 and a K-value of between 73.0 and 76.5, and being in an amount ranging between 3 wt % and 20 wt %; d) a trimellitate plasticizer, being present in an amount ranging between 5 wt % and 40 wt %; e) a TXIB (2,2,4-trimethyl-1,3-pentanediol diisobutyrate) plasticizer, being present in an amount ranging between 1 wt % and 20 wt %, wherein, a ratio of the trimellitate plasticizer to the TXIB plasticizer ranges between 1.0 and 9.0; f) a phenol-free Ca—Zn stabilizer, being present in an amount ranging between 0.5 wt % and 3 wt %; g) a fumed silica, being present in an amount ranging between 1 wt % and 10 wt %; h) an aluminum hydroxide, being present in an amount ranging between 0.1 wt % and 20 wt %; i) a barium sulfate, being present in an amount ranging between 0.1 wt % and 20 wt %, wherein the barium sulfate has an average particle size ranging between 1 nm and 50 nm; and j) a calcium carbonate, being present in an amount ranging between 0.1 wt % and 20 wt %, wherein the calcium carbonate has an average particle size ranging between 30 nm and 100 nm.