Title: Less abrasive composition railroad brake shoe material

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Claims: What is claimed is:

1. An improved low abrasion lead free friction material comprising, in approximate percent by weight:

    curable rubber binder   8 - 20%
    phenolic resin          2 - 5%
    lead-free inorganic
     filler                35 - 60%
    lead-free organic
     filler                15 - 45%
    fiber                   3 - 9%.

2. The improved lead-free friction material of claim 1 wherein said curable rubber binder comprises a rubber selected from the group consisting of butyl rubber, chlorinated butyl rubber, styrene-butadiene rubber, and nitrile rubber.

3. A lead-free friction material composition comprising, in percent by weight:

    curable rubber binder  13.9%
    phenolic resin         3.5%
    rubber additives       2.7%
    inorganic filler       41.7%
    organic filler         34.7%
    fiber                  3.5%      .

4. A lead-free friction material composition comprising, in percent by weight:

    Curable rubber binder  6.0%
    phenolic resin         3.2%
    rubber additives       4.8%
    inorganic fillers      48.0%
    organic fillers        30.0%
    fiber                  8.0%      .

5. A lead-free friction material composition comprising, in percent by weight;

    curable rubber binder  12.8%
    phenolic resin         2.6%
    rubber additives       1.5%
    inorganic fillers      57.5%
    organic fillers        19.2%
    fiber                  6.4%      .

6. An improved low abrasion lead free friction material comprising in approximate per cent by weight:

    curable rubber binder   8 - 20%
    phenolic resin          2 - 5%
    lead-free inorganic filler
                           35 - 60%
    lead-free organic filler
                           15 - 45%
    fiber                   2 - 12%.

7. The improved lead-free friction material of claim 6 wherein said curable rubber binder comprises a rubber selected from the group consisting of butyl rubber, chlorinated butyl rubber, styrene-butadiene rubber, and nitrile rubber.
Other info:

Inventors: Adelmann, John Charles (Littleton, CO, US)

Application Number: 575306
Filing Date: 1975-05-07
Publication_date: 1976-05-25
Assignee: Johns-Manville Corporation (Denver, CO)
Primary Class(es): 523/158 51/298, 51/299, 106/36, 188/251A, 260/998.13, 524/14, 524/511, 525/133, 525/139, 525/141
Other Classes:
US Patent Ref:

2052779	Sep, 1936	Lidkea et al.	106/36.
3344094	Sep, 1967	DE Gaugue	188/251.
3673276	Jun, 1972	Keller	188/251.
3684062	Aug, 1972	Johnson	188/251.

Other Refs: 561,962

Aug, 1958	CA

Primary Examiner: Czaja, Donald E.
Assistant Examiner: Fletcher, H. H.
Attorney: Krone; Robert M., Kelly; Joseph J., McClain; James W.