Method for preparing polyethylene with high melt strength
AssigneeDow Global Technologies LLC
InventorsNicolas C. Mazzola, Mariana D. Mancini, Jorge C. Gomes
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Abstract
The present invention is a method for increasing the melt strength of a polyethylene resin comprising reacting the polyethylene resin with an alkoxy amine derivative corresponding to the formula: (R1)(R2)N—O—R3 where R1 and R2 are each independently of one another, hydrogen, C4-C42 alkyl or C4-C42 aryl or substituted hydrocarbon groups comprising O and/or N, and where R1 and R2 may form a ring structure together; and where R3 is hydrogen, a hyrdrocarbon or a substituted hydrocarbon group comprising O and/or N. Preferred groups for R3 include —C1-C19alkyl; —C6-C10aryl; —C2-C19akenyl; —O—C1-C19alkyl; —O—C6-C10aryl; —NH—C1-C19alkyl; —NH—C6-C10aryl; —N—(C1-C19alkyl)2. R3 most preferably contains an acyl group.
Claims9
A method for increasing the melt strength of a polyethylene resin comprising the steps of:
- a. selecting a polyethylene resin having a density, as determined according to ASTM D792, in the range of from 0.865 g/cm3 to 0.962 g/cm3, and a melt index, as determined according to ASTM D1238 (2.16 kg, 190° C.), in the range of from 0.01 g/10min to 100 g/10 min, wherein the polyethylene resin is selected from the group consisting of high density polyethylene (HDPE), linear low density polyethylene (LLDPE) and blends thereof;
- b. reacting an alkoxy amine derivative with the polyethylene resin in an amount and under conditions sufficient to increase the melt strength of the polyethylene resin, wherein the alkoxy amine derivative is added to the polyethylene resin as a masterbatch comprising the alkoxy amine derivative along with a carrier resin comprising LDPE.
Dependencies are inferred from the claim text.