The Dow Chemical Company

Randall S Shipley

Kirby Lowery, Jr

Donald F Birkelbach

Fred L Vance, Jr

Ronald L Gibbs

Larry E Freyer

James A Allen

Stephen M Imfeld

A multilayer film having as one surface layer thereof a support layer containing a thermoplastic resin able to withstand temperatures up to 200 degrees C. without softening and the other surface layer an adhesive layer containing a thermoplastic resin having a melting point ranging from about 100 to 200 degrees C. Optionally, a tie layer may be employed between the support layer and the adhesive layer. The multilayer film is useful as a protective carrier sheet for a cladding metal foil used in the production of printed circuit boards. The carrier sheet provides temporary, peelable surface protection for the cladding metal foil preventing contamination and physical damage to the foil both before and during printed circuit board formation. Adhesion of the carrier sheet to the cladding metal foil, measured using a 180 degree peel test is less than 0.4 pounds/in-width and greater than 0.005 pounds/in-width, and preferably less than 0.1 pounds/in-width and greater than 0.01 pounds/in-width.

Multilayer film and laminate for use in producing printed circuit boards

Compositions exhibiting high catalytic activity in the polymerization of .alpha.-olefins are prepared by reacting a mixture of a tetrahydrocarbyloxy titanium compound such as tetraisopropyl titanate and/or a titanium tetrahalide such as titanium tetrachloride and a titaniumoxydihalide such as titaniumoxydichloride, an organomagnesium component such as a hydrocarbon soluble complex of dialkyl magnesium and an organoaluminum compound such as triethyl aluminum and a halide source such as ethyl aluminum dichloride. Polymerization processes employing this catalyst composition do not require conventional catalyst removal steps in order to provide polymers having suitable color and other physical characteristics and these catalysts provide higher efficiencies and a broader molecular weight distribution than those catalysts employing either of the titanium compounds alone.

High efficiency catalyst for polymerizing olefins

Alpha olefins are polymerized in the presence of catalyst compositions which are the catalytic reaction products of (A) the reaction product or complex resulting from the mixing of (1) a mixture of a transition metal compound such as a tetraalkoxy titanium compound, a non-metallic oxygen-containing compound such as an alcohol and (2) a reducing alkylating agent such as a dialkyl magnesium compound and (B) a magnesium halide.

Process for polymerizing alpha-olefins

Transition metal-derived coordination catalyst residues are neutralized by contacting with a pseudo-polyester material such as calcium stearoyl lactylate, which is comprised of a metal salt of a condensation reaction product of a fatty acid and a hydroxyl-containing acid.

Neutralizing polyethylene catalyst residues

Alpha-olefins are polymerized in the presence of a catalyst which is the catalytic reaction product of

Polymerizing olefins with catalysts containing the reaction product of a

Compositions consisting of the reaction product or complex resulting from the mixing of a transition metal compound such as a tetraalkoxy titanium compound and a boron compound such as a trialkyl boron compound are useful in the preparation of catalysts for polymerizing .alpha.-olefins exhibiting ultra-high efficiencies at high polymerization temperatures.

Reaction products of transition metal compounds and boron compounds and

Compositions consisting of the reaction product or complex resulting from the mixing of a transition metal compound such as a tetraalkoxy titanium compound and an organo compound of magnesium, aluminum, boron or lithium such as a dialkyl magnesium compound are useful in the preparation of catalysts for polymerizing .alpha.-olefins at ultra-high efficiencies at high polymerization temperatures.

Ultra high efficiency catalyst for polymerizing olefins

Olefins are polymerized in the presence of a catalyst prepared by reacting a mixture of a tetrahydrocarbyloxy titanium compound such as tetraisopropyl titanate and a hydrocarbyloxy titanium oxide such as di(isopropoxy) titanium oxide, an organomagnesium component such as a hydrocarbon soluble complex of dialkyl magnesium and an organoaluminum compound such as triethyl aluminum and a halide source such as ethyl aluminum dichloride. The catalysts employed in this process provide higher efficiencies than these catalysts employing either of the titanium compounds alone.

Process for polymerizing olefins

Compositions exhibiting high catalytic activity in the polymerization of .alpha.-olefins are prepared by reacting trivalent or tetravalent titanium compounds such as titanium tetraalkoxides, zirconium compounds such as tri-n-butoxy zirconium chloride, an organomagnesium component such as di-n-hexyl magnesium, a halogen source such as ethyl aluminum dichloride, a divalent zinc compound such as diethyl zinc and an organoaluminum compound if the halide source or magnesium component does not contain sufficient quantities of aluminum. Polymerization processes employing this catalyst composition do not require conventional catalyst removal steps in order to provide polymers having suitable color and other physical characteristics and these catalysts produce polymers having broader molecular weight distributions and lower melt indices than do corresponding catalysts without both the divalent zinc and zirconium compounds.

High efficiency catalyst containing titanium, zirconium and zinc for

Ziegler-type catalysts are modified using zirconium compounds such as zirconium octoate and/or chromium compounds such as chromium octoate. These compounds are useful in modifying the catalysts for the polymerization of .alpha.-olefins to produce polymers having a high molecular weight and a narrow molecular weight distribution. Synergistic effects are observed when both the chromium and zirconium compounds are present. No special heating or reaction of these compounds is required prior to their use with the catalyst.

Organo zirconium-chromium mixtures, catalyst prepared therefrom and

Alpha olefins are polymerized in the presence of catalyst compositions which are the catalytic reaction products of (A) the reaction product or complex resulting from the mixing of (1) a mixture of a transition metal compound such as a tetraalkoxy titanium compound and an alcohol and (2) an essentially non-reducing alkylating agent such as a dialkyl zinc compound and (B) a magnesium halide.

Alpha-Olefins are polymerized in the presence of a catalyst which comprises (A) the reaction product of (1) a tetrahydrocarbyloxy zirconium compound such as tetraisopropoxy zirconium or a tetravalent hydrocarbyloxy zirconium halide such as triisopropoxy zirconium halide with (2) a chromium compound such as CrO.sub.3 ; (B) a solid catalyst support; (C) an organometallic activating agent or cocatalyst and (D) a trivalent or tetravelent titanium compound. The resultant polymers have a high molecular weight and a narrow molecular weight distribution.

Polymerization of olefins from catalysts prepared from organo

Compositions consisting of the reaction product or complex resulting from the mixing of (1) a mixture of a transition metal compound such as a tetraalkoxy titanium compound and an alcohol and (2) an essentially non-reducing alkylating agent such as a dialkyl zinc compound are useful in the preparation of catalysts for polymerizing .alpha.-olefins having ultra-high efficiencies at high polymerization temperatures.

Compositions consisting of the reaction product or complex resulting from the mixing of (1) a mixture of a transition metal compound such as a tetraalkoxy titanium compound with a non-metallic oxygen-containing compound such as an alcohol and (2) a strongly reducing alkylating agent such as a dialkyl magnesium compound are useful in the preparation of catalysts for polymerizing .alpha.-olefins at ultra-high efficiencies at high polymerization temperatures.

Compositions exhibiting high catalytic activity in the polymerization of .alpha.-olefins are prepared by reacting a mixture of a tetrahydrocarbyloxy titanium compound such as tetraisopropyl titanate and a hydrocarbyloxy titanium oxide such as di(isopropoxy) titanium oxide, an organomagnesium component such as a hydrocarbon soluble complex of dialkyl magnesium and an organoaluminum compound such as triethyl aluminum and a halide source such as ethyl aluminum dichloride. Polymerization processes employing this catalyst composition do not require conventional catalyst removal steps in order to provide polymers having suitable color and other physical characteristics and these catalysts provide higher efficiencies than those catalysts employing either of the titanium compounds alone.

Growing community of inventors

Alvin, TX, United States of America

Randall S Shipley