Appeal No. 96-1501
Application No. 08/172,517
The subject matter on appeal is directed to a process for
coating the inner surface of metal containers. Claim 1 is
exemplary of the invention and reads as follows:
1. A process for coating the inner surface of metal
containers having an inside volume ranging from 20 to 250 liters,
comprising:
1) electrostatically depositing on the inside surface
of bottoms, lids and bodies of containers, a polyolefin
composition selected from the group consisting of:
a) a polyethylene selected from the group
consisting of HDPE, LDPE and LLDPE, said polyethylene
having a melt index E ranging from 1 to 70 dl/g; and
b) a polypropylene composition having melt index L
ranging from 15 to 150 g/10 minutes and comprising at
least one of the following components (i) to (iii):
(i) a crystalline homopolymer of
propylene;
(ii)a propylene/ethylene crystalline
random copolymer; and
(iii)a propylene/ethylene/C "-olefin
4-10
crystalline random copolymer; and optionally,
one of the following components (iv) to (vi):
(iv)an elastomeric copolymer selected from
the group consisting of ethylene/propylene
elastomeric copolymer and ethylene/1-butene
elastomeric copolymer;
(v)a polypropylene modified with polar
groups; and
(vi)a mixture of (iv) and (v); wherein
said polyolefin composition is in powder form with
the diameter of the particles not exceeding 600
micrometers and having a particle size
2
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