Paraffin compositions having improved heat reservoir

• US 4,253,983 A
• Filed: 03/16/1978
• Issued: 03/03/1981
• Est. Priority Date: 03/16/1978
• Status: Expired due to Term

• Current Assignee: Marie J. M. P. Blanie
• Original Assignee: Marie J. M. P. Blanie
• Inventors: Blanie, Marie J. M. P.
• Primary Examiner(s): Pitlick, Harris A.
• Application Number:
  US05/887,399
• Time in Patent Office: 1,083 Days
• Field of Search: 252/70, 126/400, 128/82.1, 128/403, 128/399, 128/402, 128/400
• US Class Current: 252/70
• CPC Class Codes: C09K 5/063 Materials absorbing or liberating heat during crystallisation; Heat storage materials

Abstract

A paraffin composition that is solid at 25° C. and has an improved heat reservoir by virtue of being combined with inert solid material, wherein the paraffin composition contains from 25 to 55% by weight of at least two constituents comprising aluminium or one of its oxides or silicates, and magnesium or one of its oxides or silicates.

Claims

1. A paraffin composition that can be used as a shapable heat casing constituent, which is solid at 40°

C., and has an improved heat reservoir by virtue of being combined with inert solid material, comprising from 45 to 65% by weight of paraffin and from 35 to 55% by weight of at least two categories of constituents, the first category of constituents improving the thermal conductivity of the composition and being selected from the group consisting of magnesia, aluminum and alumina, and the second category of constituents improving the plasticity of the composition and being selected from the group consisting of kaolin and talc.

2. The composition of claim 1 consisting essentially of said paraffin and said at least two categories of constituents.

3. The composition according to claim 1, containing from 2 to 15% by weight of magnesia.

4. The composition according to claim 1, containing from 15 to 50% by weight of a constituent selected from the group consisting of aluminium and alumina.

5. The composition according to claim 4, containing from 23 to 46% by weight of alumina.

6. The composition according to claim 4, containing from 18 to 38% by weight of aluminium.

7. The composition according to claim 1, containing from 5 to 10% by weight of the first category of constituents.

8. The composition according to claim 7, containing from 7 or 9% by weight of the first category of constituents.

9. The composition according to claim 1, containing from 8 to 15% by weight of kaolin.

10. The composition according to claim 9, containing from 10 to 12% by weight of kaolin.

11. The composition according to claim 1, which is solid at 50°

C.

12. The composition according to claim 11, wherein the paraffin is a mixture of n-docosane and n-tetracosane.

13. The composition according to claim 12, wherein the proportion of n-docosane with respect to the total weight of paraffin is from 75 to 85%, and that of n-tetracosane is from 15 to 25%.