Polymeric compositions comprising polylactic and methods of making and using same
A polylactic acid, polymer technology, used in chemical instruments and methods, conjugated synthetic polymer rayon, special packaging objects, etc., can solve problems such as poor mechanical and/or physical properties
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Embodiment 1
[0119] The degree of GMA grafting on polypropylene during the preparation of the reactive modifier (ie PP-g-GMA) was investigated. Samples were prepared using base polypropylene resin 3276 and GMA (flash point 85°C, viscosity 2.7 centipoise). The base resin 3276 is a polypropylene homopolymer commercially available from Total Petrochemicals and GMA commercially available from Dow Chemicals. The multifunctional acrylate comonomers were SR259 polyethylene glycol (200) diacrylate (25 centipoise viscosity) and SR351 trimethylolpropane triacrylate (TMTPA) (106 centipoise viscosity); they Both are commercially available from Sartomer. The initiator used is the peroxide LUPERSOL 101 (L101). The formulations listed in Table 3 are expressed in parts by weight per hundred parts of base resin (phr).
[0120] In a 50 liter mixer, the 3277 fleece was mixed with the multifunctional acrylate comonomer (ie, GMA) and initiator in an amount of 30 lbs. Next, the mixed fluff was conveyed into...
Embodiment 2
[0127] The peel strength of multilayer films (eg, two-layer films) comprising polyolefins, reactive modifiers, and degradable polymers was investigated. Four two-layer film samples (referred to as samples 5-8) were prepared by preparing a 2 mil thickness film comprising a PP layer of 1.5 mil thickness and a PLA layer of 0.5 mil thickness. Sample 5 is a control sample obtained by mixing PP3371 (3371) (a polypropylene homopolymer available from Total Petrochemicals USA, Inc) with PLA 6201D (PLA) (available from Natural Engineering Inc. Co., Ltd. (Nature Works LLC) purchased a polylactic acid) co-extrusion preparation. Sample 6 was prepared by coextruding a blend of 3371 and 3% PP-g-GMA (PP-g-GMA contains 2.5% GMA) with PLA. Sample 7 was prepared by coextruding a blend of 3371 and 3% LOTADER AX8900 (a reactive modifier commercially available from Arkema) with PLA. Sample 7 is a comparative sample obtained by blending 3371 and 3% POLYBOND 3200 (a cavitation accelerator containin...
Embodiment 3
[0132] The peel strength of multilayer films comprising polyolefins, reactive modifiers and degradable polymers was investigated. A control, designated Sample 9, was prepared by coextruding 3371 with PLA to form a 2 mil thick film comprising 1.2 mil PP and 0.5 mil PLA.
[0133] Three samples, referred to as samples 10-12, were prepared using a PP layer of 1.2 mil thickness, a tie layer of 0.3 mil thickness, and a PLA layer of 0.5 mil thickness. Sample 10 was prepared by coextruding 3371 with PLA and PP-g-GMA tie layers. Sample 11 was prepared by coextruding 3371 with PLA and a LOTADER AX8900 tie layer. Sample 12 is a comparison made by coextruding 3371 with PLA and POLYBOND 3200 tie layers. Next, the peel strength of each sample was determined in the manner described in Example 2. The composition of each sample and the results of the peel strength test are listed in Table 11.
[0134] Table 11
[0135]
[0136] These results demonstrate that the film without any tie la...
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