Polyethylene compositions for injection molding

Details Polyethylene compositions for injection molding Polyethylene compositions for injection molding

2008-07-08

2008-07-08

Nutter, Nathan M (Department: 1796)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C525S240000

Reexamination Certificate

active

11186185

ABSTRACT:
Polyethylene blend compositions suitable for injection molding, injection molded articles, and processes for injection molding articles are provided. The polyethylene compositions include a first polyethylene having a melt index of 0.1 to 3.0 g/10 min and a density of from 0.905 to 0.938 g/cm3; and a second polyethylene having a melt index of 10 to 500 g/10 min and a density of 0.945 to 0.975 g/cm3. The compositions have a density of from 0.920 to 0.973 g/cm3and a melt index of 2 to 200 g/10 min, and the density of the second polyethylene is from 0.037 to 0.062 g/cm3greater than the density of the first polyethylene. The compositions exhibit improved physical properties, such as Environmental Stress Crack Resistance, relative to conventional compositions of similar melt index and density. In certain embodiments, the compositions, and articles produced therefrom, also exhibit an improved balance of toughness properties and processability properties.

REFERENCES:
patent: 3974114 (1976-08-01), Sowa
patent: 4330639 (1982-05-01), Matsuura et al.
patent: 4335224 (1982-06-01), Matsuura et al.
patent: 4336352 (1982-06-01), Sakurai et al.
patent: 4429079 (1984-01-01), Shibata et al.
patent: 4438238 (1984-03-01), Fukushima et al.
patent: 4461873 (1984-07-01), Bailey et al.
patent: 4536550 (1985-08-01), Moriguchi et al.
patent: 4547551 (1985-10-01), Bailey et al.
patent: 4577768 (1986-03-01), Go et al.
patent: 4705829 (1987-11-01), Kwack et al.
patent: 4770912 (1988-09-01), Furrer et al.
patent: 4786688 (1988-11-01), Thiersault et al.
patent: 4792588 (1988-12-01), Suga et al.
patent: 4835219 (1989-05-01), Tajima et al.
patent: 5015511 (1991-05-01), Treybig et al.
patent: 5082902 (1992-01-01), Gurevitch et al.
patent: 5189106 (1993-02-01), Morimoto et al.
patent: 5260384 (1993-11-01), Morimoto et al.
patent: 5306775 (1994-04-01), Martin et al.
patent: 5317051 (1994-05-01), Harashige et al.
patent: 5319029 (1994-06-01), Martin et al.
patent: 5346732 (1994-09-01), Lai et al.
patent: 5367025 (1994-11-01), Needham
patent: 5380803 (1995-01-01), Coutant et al.
patent: 5382630 (1995-01-01), Stehling et al.
patent: 5382631 (1995-01-01), Stehling et al.
patent: 5405901 (1995-04-01), Daniell et al.
patent: 5519091 (1996-05-01), Tsutsui et al.
patent: 5530055 (1996-06-01), Needham
patent: 5589128 (1996-12-01), Lai et al.
patent: 5605969 (1997-02-01), Tsutsui et al.
patent: 5858491 (1999-01-01), Geussens et al.
patent: 6111023 (2000-08-01), Chum et al.
patent: 6136924 (2000-10-01), Promel
patent: 6162871 (2000-12-01), Watanabe et al.
patent: 6225421 (2001-05-01), Promel et al.
patent: 6362270 (2002-03-01), Chaudhary et al.
patent: 6806338 (2004-10-01), Baann et al.
patent: 6969741 (2005-11-01), Lustiger et al.
patent: 7022770 (2006-04-01), Lustiger et al.
patent: 2005/0215719 (2005-09-01), Lustiger et al.
patent: 2005/0256266 (2005-11-01), Lustiger et al.
patent: 19992 1280 (1999-09-01), None
patent: 423 962 (1991-04-01), None
patent: 0 614 938 (1994-09-01), None
patent: 0 869 146 (1998-10-01), None
patent: 1 201 711 (2002-05-01), None
patent: 1 236 770 (2002-09-01), None
patent: 1 304 353 (2003-04-01), None
patent: 2001-89615 (2001-05-01), None
patent: WO 00/71615 (2000-11-01), None
patent: 01/12714 (2001-02-01), None
patent: WO 01/96419 (2001-12-01), None
patent: WO 02/48258 (2002-06-01), None
patent: 2004/031291 (2004-04-01), None
Dodge, Philip T., “Rotational Molding,”Encyclopedia of Polymer Science and Engineering, vol. 14, pp. 659-670, 1990.
Elvers, Barbara, et al., “Injection Molding,”Ullman's Encyclopedia of Industrial Chemistry, vol. A20, pp. 688-696, 1992.
Fair, R. L., “Rotational Molding,”Modern Plastics Mid-October Encyclopedia, vol. 66, No. 11, pp. 317-318, McGraw-Hill, Inc., 1990.

Affiliated with

Also associated with

Rating

Polyethylene compositions for injection molding does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Polyethylene compositions for injection molding, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polyethylene compositions for injection molding will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3923794