Scott Adams Colby

US Patent:

59520531, Sep 14, 1999

Filed:

Sep 26, 1997

Appl. No.:

8/938041

Inventors:

Scott A. Colby - Eugene OR

Assignee:

Willamette Valley Company - Eugene OR

International Classification:

B05D 706
B05D 134

US Classification:

427393

Abstract:

This invention relates to a process for producing filled polyurethane elastomers, and more particularly to a process for producing highly filled polyurethane elastomers in which resin solid separation is substantially reduced. The separation rate of the solid particulate fillers contained in a filled polyol resin is significantly reduced, and the subject process can be optimized to lower the viscosity of the uncured liquid reaction mixture prior to curing same to form a solid, thereby substantially non-cellular filled polyurethane elastomer. The above-described benefits can be accomplished by reacting together a three-component polyurethane system comprising (a) a filled polyether polyol resin having a particulate filler material dispersed therein, (b) a polyisocyanate, and (c) a catalyst solution for reacting (a) and (b) to form said filled polyurethane elastomer.

US Patent:

59520728, Sep 14, 1999

Filed:

Jun 9, 1997

Appl. No.:

8/871121

Inventors:

Scott Adams Colby - Eugene OR
Robert Mark Loomis - Eugene OR
Amy Laverne Clement - Eugene OR

Assignee:

Willamette Valley Company - Eugene OR

International Classification:

B32B 300

US Classification:

428 63

Abstract:

This invention provides a method for restoring at least one means defining a railroad spike hole located in a used railroad tie. In this way, the restored railroad tie can be reused in subsequent rail replacement operations. The restored railroad tie is capable of having a railroad spike penetrate and be retained within the confines of the restored railroad spike hole without substantial bending problems. The used railroad tie provided has at least one spike hole located therein. In each the means defining a railroad spike hole is formed a polymeric plug. The polymeric plug comprises a substantially non-foaming, non-cellular polymeric material. The polymeric material preferably comprises a polyurethane. The polymeric plug infiltrates and tightly bonds with the railroad spike hole to prevent moisture infiltration. Thus, substantial tie rot due to moisture is impeded, and the leaky railroad spike hole is effectively and efficiently dammed to enable complete filling thereof.