Abstract

The present invention provides a method for producing an oxymethylene copolymer which involves polymerizing trioxane and a comonomer cationically at a polymerization temperature of 135° C. to 300° C. in the presence of a protic acid salt having the molecular weight of 1000 or less, and at least one polymerization initiator selected from the group consisting of protic acids, protic acid anhydrides, and protic acid ester compounds having the molecular weight of 1000 or less.

IPC Classes  ?

• C08G 65/10 - Saturated oxiranes characterised by the catalysts used
• C08G 65/30 - Post-polymerisation treatment, e.g. recovery, purification, drying
• C08K 5/13 - PhenolsPhenolates
• C08K 5/3492 - Triazines
• C08G 2/04 - Polymerisation by using compounds which act upon the molecular weight, e.g. chain-transferring agents
• C08G 2/06 - Catalysts
• C08G 2/10 - Polymerisation of cyclic oligomers of formaldehyde
• C08G 2/24 - Copolymerisation of aldehydes or ketones with acetals
• C08L 59/04 - Copolyoxymethylenes

Abstract

Methods of inflating an inflatable packer using a two component inflating fluid comprising epoxy and an activating agent, including pumping the epoxy and activating agent into the inflatable packer to inflate it, and then allowing the epoxy to harden thus keeping the packer inflated.

IPC Classes  ?

• E21B 33/127 - PackersPlugs with inflatable sleeve