Method of incorporating additives in polymeric materials
First Claim
1. A method of monitoring the distribution in a thermoplastic organic polymeric material of one or more additives normally solid at room temperature and selected from the group consisting of anti-oxidants, stabilizers, lubricants, flameproofing agents, slip agents, anti-blocking agents and anti-static agents, which comprises mixing said polymeric material with a uniform blend consisting essentially of said additive(s) and a compound which gives a detectable response to irradiation in the presence of said additive(s) and said polymeric material, said additive(s) and said compound being in cohesive relationship to one another, and subjecting at least a portion of the thus-treated material to the irradiation to which said compound is responsive and observing the presence or absence of a response to irradiation in said portion.
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Abstract
Additives, such as stabilizers, antioxidants, anti-static agents etc., are intimately blended with an irradiation-responsive substance, such as an optical brightener, and incorporated in a thermoplastic polymeric material which is then subjected to irradiation to determine the degree of uniformity of distribution of the additive-brightener blend.
46 Citations
17 Claims
- 1. A method of monitoring the distribution in a thermoplastic organic polymeric material of one or more additives normally solid at room temperature and selected from the group consisting of anti-oxidants, stabilizers, lubricants, flameproofing agents, slip agents, anti-blocking agents and anti-static agents, which comprises mixing said polymeric material with a uniform blend consisting essentially of said additive(s) and a compound which gives a detectable response to irradiation in the presence of said additive(s) and said polymeric material, said additive(s) and said compound being in cohesive relationship to one another, and subjecting at least a portion of the thus-treated material to the irradiation to which said compound is responsive and observing the presence or absence of a response to irradiation in said portion.
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17. A method of monitoring the distribution in a thermoplastic organic polymeric material of one or more additives normally solid at room temperature and selected from the group consisting of anti-oxidants, stabilizers, lubricants, flameproofing agents, slip agents, anti-blocking agents and anti-static agents, which comprises mixing said polymeric material with a uniform intimate blend of said additive(s) and a compound which gives a detectable response to irradiation in the presence of said additive(s) and said polymeric material, said additive(s) and said compound adhering to one another in said blend as a result of having been mixed together in a melt of at least one of said additive(s) and/or said irradiation-responsive compound, and subjecting at least a portion of the thus-treated material to the irradiation to which said compound is responsive and observing the presence or absence of a response to irradiation in said portion.
Specification