Laurence M Sylvester

US Patent:

7074846, Jul 11, 2006

Filed:

Dec 12, 2003

Appl. No.:

10/735276

Inventors:

Laurence M. Sylvester - Tiburon CA, US
Jimmy Lee Stevens - Riverside CA, US

Assignee:

RAM Technologies, Inc. - Reno NV

International Classification:

C08L 95/00

US Classification:

524 71, 524 68

Abstract:

The present invention discloses methods of making improved rubber modified asphalt cement compositions, and compositions made by the method, where the compositions are useful in paving, roofing, coating and other sealing applications. In one aspect, the method comprises combining asphalt, RVPR (or a blended mixture of asphalt and RVPR) and at least one dodecyl or tridecylbenzene sulfonic acid (SA), which can be linear (LAS) or branched (BAS), in the presence of moderate heat. After heating the resultant RMAC mixture exhibits at least one of the following: () an increase in softening point, () an increase in hardness, or () improved recovery from deformation. In another aspect, the invention teaches addition of at least one SA to previously manufactured RMAC to accomplish at least one of the following: () an increase in softening point, () an increase in hardness, or () improved recovery from deformation. For paving compositions, the resultant RMAC mixtures made by the methods of the invention are mixed with an appropriate grade of aggregate composition, and other paving materials as desired.

US Patent:

7087665, Aug 8, 2006

Filed:

Aug 29, 2003

Appl. No.:

10/652725

Inventors:

Laurence M. Sylvester - Tiburon CA, US
Jimmy Lee Stevens - Riverside CA, US

Assignee:

RAM Technologies, Inc. - Reno NV

International Classification:

C08L 95/00

US Classification:

524 61, 524 60

Abstract:

Cationic aqueous emulsions of rubber modified asphalt cement (RMAC) useable for paving, seal coat, slurry seal, roofing, coating and other applications. First, a RMAC is prepared by combining 45 to 90% by weight asphalt with about 5% to about 55% by weight solid recycled rubber (e. g. , crumb rubber from used vehicle tires) under conditions that cause at least a substantial portion of the solid rubber to become liquified or otherwise incorporated into the asphalt. The RMAC may be treated with dodecyl benzenesulfonic acid (DDBSA) which causes reaction(s) to occur and results in a lowering of the viscosity of the RMAC. The RMAC (or DDBSA-treated RMAC) may then be emulsified in an aqueous medium to provide an aqueous emulsion.

US Patent:

20030018106, Jan 23, 2003

Filed:

Jun 5, 2002

Appl. No.:

10/164350

Inventors:

Laurence Sylvester - Tiburon CA, US

Assignee:

RAM Technologies Group, Inc. - Reno NV

International Classification:

C08K003/20
C08K005/01

US Classification:

524/060000, 524/062000

Abstract:

Non thixotropic, aqueous emulsions prepared from rubber modified asphalt cement (RMAC). The RMAC is prepared by a method whereby recycled tire rubber is liquified or otherwise consumed by or incorporated into asphalt such that no more than 2% by weight of solid particulate rubber remains. The RMAC may be emulsified in an aqueous or partially aqueous emulsification solution using a one-step or multi-step emulsification process. These aqueous RMAC emulsions are useable in many applications including paving, seal coat, roofing and slurry seal applications.

US Patent:

20050131113, Jun 16, 2005

Filed:

Feb 7, 2005

Appl. No.:

11/052145

Inventors:

Laurence Sylvester - Tiburon CA, US

International Classification:

C08J003/00

US Classification:

524059000

Abstract:

Non thixotropic, aqueous emulsions prepared from rubber modified asphalt cement (RMAC). The RMAC is prepared by a method whereby recycled tire rubber is liquified or otherwise consumed by or incorporated into asphalt such that no more than 2% by weight of solid particulate rubber remains. The RMAC may be emulsified in an aqueous or partially aqueous emulsification solution using a one-step or multi-step emulsification process. These aqueous RMAC emulsions are useable in many applications including paving, seal coat, roofing and slurry seal applications.

US Patent:

20070249762, Oct 25, 2007

Filed:

Jul 10, 2006

Appl. No.:

11/484334

Inventors:

Laurence M. Sylvester - Tiburon CA, US

Assignee:

RAM Technologies Group, Inc. - Tiburon CA

International Classification:

C08L 95/00

US Classification:

524 71

Abstract:

Rubber modified asphalts and their methods of manufacture. One or more sulfonic acids is/are added to a mixture of asphalt and rubber particles, or to an existing rubber modified asphalt composition. Heat and/or mixing may be applied during or after addition of the sulfonic acid(s).

US Patent:

20110274487, Nov 10, 2011

Filed:

May 6, 2011

Appl. No.:

13/102393

Inventors:

Laurence M. Sylvester - Tiburon CA, US

Assignee:

RAM TECHNOLOGIES, INC. - Tiburon CA

International Classification:

E01C 11/24
B05D 7/00
C09D 191/00
C08L 95/00
C09D 195/00
C09D 121/00

US Classification:

404 72, 524 59, 1062731, 427140

Abstract:

Asphalt binder compositions are formed by combining asphalt with a reclaimed or re-refined oil. The boiling point of the oil may be greater than its flash point. The asphalt may be polymer modified or non-polymer modified. These asphalt binder compositions may be combined with aggregate and/or other matter (e.g., rubber particles) to form cold patch compositions suitable for various applications such as patching potholes, cracks or other defects in roads, driveways, roofs or other paved surfaces.