Reference

Modification of polyethylene with methacrylic acid

Modification of polyethylene with methacrylic acid. II. Molecular structure of the grafted copolymer. Bryjak, Marek; Trochimczuk, Witold (Inst. Org. Polym. Technol., Tech. Univ. Wroclaw, Wroclaw 50-370, Pol.). Angew. Makromol. Chem., 118, 191-5 (English) 1983. CODEN: ANMCBO. ISSN: 0003-3146. DOCUMENT TYPE: Journal CA Section: 36 (Physical Properties of Synthetic High Polymers) The structure of ethylene-methacrylic acid graft copolymer [25053-53-6] was studied by statistical anal. of grafting, assuming that grafting took place only at tertiary C atoms, that the no. of Me groups and branching points in polyethylene (I) segments were equal, that branching points were randomly distributed and independent of chain length, and that polyethylene and poly(methacrylic acid) (II) were monodisperse. A model for copolymer structure was proposed in which 1 II chain was attached to 1 I chain. Bz2O2 did not influence the mol. wt. distribution of the parent I under the grafting conditions used. Av. graft d. for the blend contg. 0.5 mmol grafted II/mL was 1.6. Thus, ~20% low-d. I was grafted, and only a small fraction of I contained >1 grafted II chain.

Composite film laminated to a support film

Composite film laminated to a support film. Engelsberger, Herbert (Feldmuehle A.-G., Fed. Rep. Ger.). Ger. Offen. DE 3216097 A1 3 Nov 1983, 23 pp.There are some reagents with their cas registry numbers 25038-54-4 and 9002-88-4 are used in this study. (German). (Germany). CODEN: GWXXBX. CLASS: IC: B32B027-32; B32B007-02; B65D065-40; B29D009-00. APPLICATION: DE 82-3216097 30 Apr 1982. DOCUMENT TYPE: Patent CA Section: 38 (Plastics Fabrication and Uses) Multilayer films useful for the vacuum packaging of food consist of a support film laminated to a blown-bubble coextruded composite film having 2 similar inner layers and 2 similar outer layers of various thicknesses and mech. shock resistance. Thus, in the manuf. of a multilayer vacuum deep draw film, a 2-layer blown-bubble coextruded composite film of varying thicknesses was prepd. and then interlocked. The 2 outer layers of this 4-layer composite film consisted of an ethylene-vinyl acetate copolymer [24937-78-8] having mech. shock resistance 145 cN and melt index 0.8; the 2 inner layers consisted of a Na ion-crosslinked ethylene-methacrylic acid copolymer [25053-53-6] having mech. shock resistance 450 cN and melt index 1.4. The total thickness of the 2 outer and 2 inner layers amounted to 2/3 and 1/3 of the total thickness of the film, resp. The composite film was laminated with a support film of unstretched nylon 6 [25038-54-4] having a thickness 1/2 that of the composite film. The multilayer film having a thickness of 240 mm was suitable for the vacuum packaging of sausage. .