David M Schrader

US Patent:

6350813, Feb 26, 2002

Filed:

Nov 24, 1999

Appl. No.:

09/448818

Inventors:

David Schrader - Midland MI
Steven M. Black - Midland MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C08F27902

US Classification:

525 89, 525 98, 525 99

Abstract:

The present invention refers to a rubber modified monovinylidene aromatic polymer composition wherein the rubber is in the form of discrete, dispersed rubber particles and comprises: a) from 75 to 25 weight percent based on the total weight of rubber, of a star branched diene rubber, having a cis 1,4 structure content of less than 75 percent; and b) from 25 to 75 weight percent, based on the total weight of rubber, of a linear diene rubber, having a cis 1,4 structure content of less than 50 percent.

US Patent:

6441090, Aug 27, 2002

Filed:

Oct 28, 1999

Appl. No.:

09/423027

Inventors:

Mehmet Demirors - Midland MI
David Schrader - Midland MI
Steven M. Black - Midland MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C08F27902

US Classification:

525 71, 525 89, 525 98, 525 99

Abstract:

The present invention is a rubber modified monovinylidene aromatic polymer having a bimodal particle size distribution comprising: a) rubber particles of a star or branched low viscosity rubber having a volume average particle size of from 0. 1 to 2, and a cellular or core shell morphology or mixture thereof, and b) rubber particles of a star or branched low viscosity rubber, linear diene rubber or block copolymer rubber having a volume average particle size of from 0. 5 to 10, characterized in that the rubber particles of b) are more dense than the rubber particles of a), having a smaller occluded monovinylidene aromatic polymer content than the particles of a), wherein the particles of a) are from 50 to 99 weight percent of the total diene rubber content.

US Patent:

6444752, Sep 3, 2002

Filed:

May 9, 2001

Appl. No.:

09/852198

Inventors:

Mehmet Demirors - Midland MI
Dianne J. M. Maughon - Midland MI
Jose M. Rego - Heikant Hulst, NL
David Schrader - Midland MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C08F27902

US Classification:

525 71, 525316

Abstract:

Disclosed are rubber-modified monovinylidene aromatic polymers with improved toughness and rigidity as well as a process for the preparation thereof. The polymer comprises: a) a monovinylidene aromatic polymer matrix, b) rubber particles dispersed therein, characterized in that the rubber particles are produced from a diene rubber having I) from 20 to 80 percent, based on the total weight of said rubber particles, of a high solution viscosity component having a viscosity value ranging from 110 to 500 centipoise and II) from 80 to 20 percent, based on the total weight of said rubber particles, of a low solution viscosity component having a viscosity value ranging from 1 to 100 centipoise, further characterized in that the ratio of solution viscosity of high solution viscosity component to the solution viscosity of low solution viscosity ranges from 1. 1 to 500, wherein both components I and II have a 1,4 cis content of greater than 30 percent, and III) the rubber is grafted with monovinylidene aromatic polymer to the extent that there is at least 30 percent monovinylidene aromatic polymer present as grafts on the rubber.

US Patent:

6545090, Apr 8, 2003

Filed:

Nov 16, 2000

Appl. No.:

09/714306

Inventors:

Mehmet Demirors - Midland MI
David Schrader - Midland MI
Jose M. Rego - Heikant, NL

Assignee:

Dow Global Technologies Inc. - Midland MI

International Classification:

C08L 5104

US Classification:

525 70, 525 71, 525 86

Abstract:

The present invention is a rubber modified monovinylidene aromatic polymer comprising: a) a monovinylidene aromatic polymer matrix, b) rubber particles dispersed therein, characterized in that the rubber particles are produced from a diene rubber having I) a high molecular weight component and II) a low molecular weight component; the high molecular weight component having a weight average molecular weight at least two and one half times greater than the weight average molecular weight of the low molecular weight component, wherein both components I and II have a 1,4 cis content of greater than 70 percent and III) the rubber is grafted with monovinylidene aromatic polymer to the extent that there is at least 30 percent monovinylidene aromatic polymer present as grafts on the rubber.

US Patent:

20100298486, Nov 25, 2010

Filed:

Sep 11, 2007

Appl. No.:

12/439956

Inventors:

Zenon Lysenko - Midland MI, US
Amaia Montoya-Goni - Bergen Op Zoom, NL
David Schrader - Midland MI, US
Alan K. Schrock - Lake Jackson TX, US
Gregory Chambard - Nivelles, BE

Assignee:

DOW GLOBAL TECHNOLOGIES INC. - Midland MI

International Classification:

C08L 51/04
C08L 25/02
C08L 53/00
C08L 55/02

US Classification:

524504, 524577, 524505

Abstract:

Monovinylidene aromatic polymers, e.g., general purpose polystyrene or high impact polystyrene, are plasticized with a nonfunctionalized, nonmineral oil, e.g., a vegetable oil such as canola oil, cottonseed oil or the like. The mixture of monovinylidene aromatic polymer and oil is typically and preferably free of any significant amount of functionalized nonmineral oil, and it typically contains at least 0.1 weight percent of the nonfunctionalized, nonmineral oil, alone or in combination with a mineral oil, based on the weight of the polymer. The nonmineral oil has an iodine value of less than 120, and a hydroxyl number of less than 20.

US Patent:

63232820, Nov 27, 2001

Filed:

Apr 20, 2000

Appl. No.:

9/553298

Inventors:

Mehmet Demirors - Midland MI
David Schrader - Midland MI
Jose M. Rego - Hulst, NL

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C08F25500
C08F25508

US Classification:

525191

Abstract:

The present invention is related to a bimodal rubber characterized in that the bimodal rubber is a composition of linear, and branched rubber molecules, and has a broad, yet monomodal Mw distribution and rubber modified polymers produced therefrom.

US Patent:

54281067, Jun 27, 1995

Filed:

Sep 2, 1993

Appl. No.:

8/116163

Inventors:

David Schrader - Midland MI
Mark E. Soderquist - Midland MI
Mark D. Heires - Midland MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C08L 5104

US Classification:

525 71

Abstract:

High impact polystyrene resins are provided having a surprisingly good combination of toughness and gloss characteristics. Such resins contain small (i. e. , 0. 1 to 0. 4 micron) capsule morphology rubber particles in combination with relatively small (i. e. , 0. 25 to 1 micron) entanglement morphology rubber particles. It has been found that such resins are capable of providing Izod impact strength values in the range of 2. 5 to 3. 5 ft-lb/in (133. 4 to 186. 7 J/m) and higher at an overall volume average rubber size of less than 0. 4 micron with corresponding gloss values in excess of 90 percent.

US Patent:

54911958, Feb 13, 1996

Filed:

Dec 21, 1994

Appl. No.:

8/360868

Inventors:

David Schrader - Midland MI
Mark E. Soderquist - Midland MI
Mark D. Heires - Midland MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C08L 5104

US Classification:

525 71

Abstract:

High impact polystyrene resins are provided having a surprisingly good combination of toughness and gloss characteristics. Such resins contain small (i. e. , 0. 1 to 0. 4 micron) capsule morphology rubber particles in combination with relatively small (i. e. , 0. 25 to 1 micron) entanglement morphology rubber particles. It has been found that such resins are capable of providing Izod impact strength values in the range of 2. 5 to 3. 5 ft-lb/in (133. 4 to 186. 7 J/m) and higher at an overall volume average rubber size of less than 0. 4 micron with corresponding gloss values in excess of 90 percent.