Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
373 words
Process of reclaiming rubber in which ground or crushed rubber scrap which has the form of particles with a particle size of at most 1 mm which has been freed of the major fraction of its textile or metal impurities, is degraded with the aid of chemical reclaiming agents which comprise a reducing agent, an oxidizable iron metal chloride and a plasticizer, the reclaiming being carried out in the solid phase in oxygenic gas at a temperature of at most 100° C. by agitation in a powder mixer, until the reducing agent has substantially completely reacted with double bonds in the rubber, wherein said reclaiming is caused to continue for a time of at most 30 min. wherein, as a reducing agent, there is added a member of the group consisting of phenyl hydrazine in an amount of 0.2-1 weight % and diphenyl guanidine in an amount of 0.2-0.8 weight %, wherein the iron metal chloride is added in an amount of from 0.1 to 0.4 weight %, wherein, as plasticizer there is added a composition comprising at least one member selected from the group consisting of tall oil pitch and dipentene, providing: (a) that the total amount of plasticizer is at most 17.5 weight %; (b) that the amount of dipentene is at most 5 weight %; (c) that the amount of tall oil pitch is at most 17.5 weight %; (d) that the amount of dipentene, when it is used as a sole plasticizer or in mixture with another plasticizer, is from 0.5 to 5 weight %; (e) that the amount of tall oil pitch, when it is used as sole plasticizer or in mixture with a plasticizer other than dipentene, is from 7 to 17.5 weight %; (f) that the amount of any plasticizer other than tall oil pitch and dipentene is at most 10 weight %; and (g) that the amount of tall oil pitch, when it is used together with dipentene, varies in inverse proportion to the amount of dipentene and is from 8 to 16 weight % with dipentene amounts of from 5 to 0.5 weight %; all of the above percentages being calculated on the mixture of rubber scrap, reducing agent, iron metal chloride and plasticizer.
Claim 2
Dependent Claim
13 words
Process according to claim 1 wherein said temperature is at most 80° C.
Claim 3
Dependent Claim
20 words
Process according to claim 1, wherein the direct reclaiming is carried out at a temperature of at most 60° C.
Claim 4
Dependent Claim
21 words
Process according to claim 1, wherein, as reducing agent, there is added diphenyl guanidine in an amount of 0.3-0.5 weight %.
Claim 5
Dependent Claim
24 words
Process according to claim 1 wherein the rubber is added in the form of particles with a particle size of at most 0.8 mm.
Claim 6
Dependent Claim
24 words
Process according to claim 1, wherein the rubber is added in the form of particles with a particle size of at most 0.4 mm.
Claim 7
Dependent Claim
40 words
Process according to any one of claims 1 wherein the direct reclaiming is carried out under agitation in an impeller mixer, whose impeller or impellers are preferably driven at a peripheral speed of the order of magnitude of 2000 m/min.
Claim 8
Dependent Claim
26 words
Process according to any one of claims 1 wherein the direct reclaiming is carried out under agitation in a trough mixer of the ribbon mixer type.
Claim 9
Dependent Claim
28 words
Process according to any one of claims 7, or 8 wherein an antitackifier, preferably kaolin, is added to the mixer during the later stage of the agitation phase.
Claim 10
Dependent Claim
14 words
Process according to claim 1 wherein said time is from 3 to 15 minutes.
Claim 11
Dependent Claim
13 words
Process according to claim 1 wherein said iron metal chloride is ferrous chloride.
Claim 12
Dependent Claim
21 words
Process according to claim 1 wherein said plasticizer other than dipentene and other than tall oil pitch is mineral process oil.