发明授权
US06540790B2 Tanning leather 有权
晒黑皮革

Tanning leather
摘要:
Leather is tanned by cross-linking collagen with tris(hydroxymethyl)phosphine or a condensate of a tetrakis(hydroxymethyl)phosphonium salt with an amide or amine in a main tannage or retannage.
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