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US 4,048,355 AGranted
Process for the formation of a polyolefin coating layer onto a metal surface
AssigneesMitsui Petrochemical Industries, Ltd., Toa Paint Co., Ltd.
InventorsSeigo Sakayori, Tomoyosi Kuro, Kazuyuki Morita, Nobuya Hinooka, Hirozi Niimi, Kensuke Komatsu
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Abstract
A process for forming a polyolefin coating layer onto a surface of a metal which comprises coating an uncured epoxy resin layer onto the surface of a metal and melt-bonding a polyolefin modified with an unsaturated carboxylic acid or an anhydride thereof onto the uncured epoxy resin layer coated onto said metal surface. The coating layer has a high bonding strength and excellent water resistance, especially resistance against brine.
Claims19
A process for coating a metal surface with a polyolefin comprising:
- I. coating a metal surface with a first layer consisting essentially of an uncured epoxy resin and least one curing agent;
- and
- Ii. melt-bonding onto the first uncured layer, a second layer which is:
- A. a first polyolefin modified by copolymerization with one member of the group consisting of:
- i. an unsaturated dicarboxylic acid having the carboxylic groups attached to adjacent carbon atoms,
- ii. an anhydride of the acid of (i);
- or
- B. a blend of polyolefins consisting essentially of:
- i. a second polyolefin, and
- ii. the modified first polyolefin of (A),
- the polyolefin of (B) (i) and (B) (ii) being the same or different,
- with the provisos that:
- (1) for (A), the weight percentage of the repeating units of (A) (i) or (A) (ii) is from 10.sup.-4 to 10% of the modified polyolefin;
- and (2) for (B), the weight percentage of the repeating units of (B) (ii) is from 10.sup.-4 to 10% of the polyolefin blend.
11 more elements
Dependencies are inferred from the claim text.