Charles A Lyons

US Patent:

43628494, Dec 7, 1982

Filed:

Nov 19, 1980

Appl. No.:

6/208210

Inventors:

Lu H. Tung - Midland MI
Larry L. Kirkby - Midland MI
Charles E. Lyons - Midland MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C08F23610

US Classification:

525316

Abstract:

Butadiene is partially polymerized anionically in the presence of styrene to form a styrene-butadiene rubber of low styrene content. The resultant living polymer is terminated, butadiene removed, and optionally the styrene polymerized with or without additional styrene to form impact resistant styrene polymer.

US Patent:

43118194, Jan 19, 1982

Filed:

Nov 19, 1980

Appl. No.:

6/208209

Inventors:

Lu H. Tung - Midland MI
Larry L. Kirkby - Midland MI
Charles E. Lyons - Midland MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C08F23610

US Classification:

526173

Abstract:

Butadiene is partially polymerized anionically in the presence of styrene to form a styrene-butadiene rubber of low styrene content. The resultant living polymer is terminated, butadiene removed, and optionally the styrene polymerized with or without additional styrene to form impact resistant styrene polymer.

US Patent:

41002270, Jul 11, 1978

Filed:

Apr 4, 1977

Appl. No.:

5/784483

Inventors:

Corwin J. Bredeweg - Midland MI
Kent S. Dennis - Midland MI
Charles E. Lyons - Midland MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C08F27902

US Classification:

260880R

Abstract:

An improved resinous structure is disclosed. The structure has a transparent resinous matrix of polystyrene, a light absorbance (optical density) at 640 millimicrons wave length which is not more than 0. 10 when the structure has a thickness of 10 mils. The structure contains a discontinuous phase of a diene rubber in a proportion of about five to twelve parts by weight per hundred parts by weight of the structure. The rubber is present in the form of particles having an average diameter not exceeding about 2 microns. The particles are of a cellular nature and principally of a closed-cell configuration. The cell walls of the particles are not more than about 0. 15 microns in thickness. The rubber particles contain occluded therein a polymer of a composition generally identical to the matrix polymer. Such resinous bodies are transparent, impact resistant, and suitable for many packaging applications.

US Patent:

44093691, Oct 11, 1983

Filed:

May 21, 1981

Appl. No.:

6/265760

Inventors:

Charles E. Lyons - Midland MI
Lu H. Tung - Midland MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C08L 5302

US Classification:

525314

Abstract:

Styrene is polymerized employing a free radical initiator in the presence of a styrene-diene block copolymer of the AB or AB (BA). sub. n configuration to provide a polymer containing from about 15 to 30 weight percent diene units polymerized therein. The polymer contains polydiene domains in the form of rods and spheres having diameters of 50 nanometers or less.

US Patent:

41002288, Jul 11, 1978

Filed:

Apr 4, 1977

Appl. No.:

5/784482

Inventors:

Kent S. Dennis - Midland MI
Charles E. Lyons - Midland MI
Corwin J. Bredeweg - Midland MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C08F27906

US Classification:

260880R

Abstract:

An improved resinous structure is disclosed. The structure has a transparent resinous matrix having a light absorbance (optical density) at 640 millimicrons wavelength which is not greater than 0. 07 when the structure has a thickness of 10 mils. The continuous matrix polymer is a polymer of about 65 to 95 parts by weight of styrene and 5 to 35 parts by weight of methylmethacrylate. The structure contains a discontinuous phase of a diene rubber in a proportion of about 4 to 12 parts by weight. The rubber is present in the form of particles having an average diameter not exceeding 2 microns, the particles are of a cellular nature and principally of a closed-cell configuration. The cell walls of the particles are not greater than about 0. 15 microns in thickness. The rubber particles contain, occluded therein, polymer of a composition generally identical to the matrix polymer.