Binder mixture

• US 5,304,225 A
• Filed: 10/25/1991
• Issued: 04/19/1994
• Est. Priority Date: 05/15/1990
• Status: Expired due to Term

• Current Assignee: Hexion Specialty Chemicals GmbH (Bakelite UK TopCo Ltd.)
• Original Assignee: Rutgerswerke AG (Rain Industries Ltd.)
• Inventors: Adolphs, Peter, Gardziella, Arno, Meier, Bertold E., Schwieger, Karl-Heinz, Suren, Josef
• Primary Examiner(s): Klemanski, Helene
• Assistant Examiner(s): THOMPSON, WILLIE
• Application Number:
  US07/773,895
• Time in Patent Office: 907 Days
• Field of Search: 51/298, 524/841
• US Class Current: 51/298
• CPC Class Codes: C04B 35/524 obtained from polymer precursors, e.g. glass-like carbon material
• CPC Class Codes: C04B 35/532 containing a carbonisable binder

Abstract

Mixtures consisting of a phenolic resin, a hardener, and residues from bisphenol-A production in the ratio of 1:9 to 9:1 are used for the production of binder mixtures for thermostable molding materials. Usable for said purpose are binders with a minimum content of phenolic resin of 10%.

Claims

1. Carbon-forming binder mixture for the production of thermostable molding materials, characterized in that it contains a mixture of phenol resin and resinous residues from bisphenol-A production.

2. Binder mixture according to claim 1, characterized in that it contains at least 10% by weight phenol resin.

3. Binder mixture according to claim 1, characterized in that bisphenol-A residue and phenol resin are contained therein in mixture ratios of 1:

9 to 9;

1.

4. Binder mixture according to claim 1, characterized in that bisphenol-A residue and phenol resin are contained therein in mixture ratios of 2:

3 to 3;

2.

5. Binder mixture according to claim 1, characterized in that bisphenol-A residue and phenol resin are contained therein in a mixture ratio of 1:

1.

6. Binder according to claim 1, characterized in that as phenol resin a novolac is employed whose molar ratio of phenol to formaldehyde is 1:

0.2 to 1;

0.55.

7. Binder mixture according to claim 6, characterized in that it contains as additional resin a pulverized resin.

8. Binder mixture according to claim 7, characterized in that the pulverized resin is a novolac resin.

9. Binder mixture according to claim 7, characterized in that the pulverized resin is a condensation product from bisphenol-A residues, phenol and an aldehyde.

11. Binder mixture according to claim 1, characterized in that it contains 1 to 20% by weight of a hardener.

12. Binder mixture according to claim 11, characterized in contains as hardener hexamethylene tetramine.

13. Binder mixture for the production of thermostable molding materials according to claim 1, characterized in that it has a melting point in the range of from 30°

to 55°

C.

14. Binder mixture according to claim 1, characterized in that it has at a temperature of 100°

C. in the melt a viscosity in the range of 300 to 5,000 mPa'"'"'s.

15. The binder mixtures according to claim 1 for the production of unshaped refractory compositions.

16. The binder mixtures according to claim 1 for the production of shaped refractory compositions.

17. The binder mixtures according to claim 1 for the production of carbon materials.

18. The binder mixture according to claim 1 for the production of grinding wheels.

19. The binder mixtures according to claim 1 for the production of friction linings.

10. Pulverized resin, produced by condensation of phenol, bisphenol-A residues and formaldehyde under acid conditions.