Package having dessicant composition

• US 4,036,360 A
• Filed: 11/12/1975
• Issued: 07/19/1977
• Est. Priority Date: 11/12/1975
• Status: Expired due to Term

• Current Assignee: Vistatech Corporation
• Original Assignee: Graham Magnetics, Inc.
• Inventors: Deffeyes, Robert J.
• Primary Examiner(s): Lesmes, George F.
• Assistant Examiner(s): Dixon, Jr., William R.
• Application Number:
  US05/631,361
• Time in Patent Office: 615 Days
• Field of Search: 252/194, 260/37 N, 428/308, 428/309, 428/330, 428/331, 428/913, 428/35, 428/425, 206/204
• US Class Current: 206/204
• CPC Class Codes: B65D 81/266 for absorbing gases, e.g. oxygen absorbers or desiccants B65D51/244, B65D51/30 take precedence
• CPC Class Codes: Y10S 428/913 Material designed to be responsive to temperature, light, moisture
• CPC Class Codes: Y10T 428/249986 Void-containing component contains also a solid fiber or solid particle
• CPC Class Codes: Y10T 428/258 Alkali metal or alkaline earth metal or compound thereof
• CPC Class Codes: Y10T 428/259 Silicic material
• CPC Class Codes: Y10T 428/31609 Particulate metal or metal compound-containing

Abstract

A package comprising a dessicant material consisting essentially of 1 a dessicant and 2 tough, film-forming, resin having a high moisture vapor transmission rate. A prepolymerized polyurethane is particularly useful. The material is of particular value as a package insert - e.g. with film or cameras or as a coating material which can be utilized on equipment to be protected or, most advantageously, on the interior walls of packaging boxes and the like.

Claims

1. A dessicant composition of the type adapted to absorb moisture in packing applications comprising

at least 20% of a particulate dessicant material and

b. as a binder therefor, an effective quantity of a organic resin comprising at least about 50% of a prepolymerized polyurethane resin having an MVT value of at least 40 grams per 24 hours per 100 in², and wherein said polyurethane has the following minimal physical characteristics:

Tensile strength -- 1000 psi and

Elongation -- 200%.

2. A dessicant composition as defined in claim 1 comprising at least 60% by volume of dessicant.

3. A composition as defined in claim 2 wherein said MVT value is between 75 and 100 grams per 100 square inches.

4. A composition as defined in claim 1 wherein said elongation is at least 100% and said tensile strength is at least 6,000 psi.

5. A composition as defined in claim 1 having an MVT value of at least 50.

6. A package comprising, adherent to an interior surface thereof a dessicant composition as defined in claim 1.

7. A package comprising, loosely contained therein, a dessicant article formed of the composition defined in claim 1.

8. A dessicant sheet comprising a composition as defined in claim 1 and said composition having an MVT value of over about 50.

9. A sheet as defined in claim 8 wherein said elongation is at least 100% and said tensile strength is at least 6,000 psi.

10. A process for making a dust-free dessicant composition comprising mixing said dessicant in a prepolymerized polyurethane binder, and solidifying said binder as defined in claim 1 to form said dust-free composition.