US 12,006,131 B2
Two-component aerosol can
Jochen Bürkle, Steinheim an der Murr (DE)
Assigned to SIKA TECHNOLOGY AG, Baar (CH)
Appl. No. 16/767,341
Filed by SIKA TECHNOLOGY AG, Baar (CH)
PCT Filed Nov. 27, 2018, PCT No. PCT/EP2018/082637
§ 371(c)(1), (2) Date May 27, 2020,
PCT Pub. No. WO2019/102024, PCT Pub. Date May 31, 2019.
Claims priority of application No. 10 2017 127 914.8 (DE), filed on Nov. 27, 2017.
Prior Publication US 2020/0399051 A1, Dec. 24, 2020
Int. Cl. B65D 83/14 (2006.01); B65D 83/66 (2006.01)
CPC B65D 83/66 (2013.01) 20 Claims
OG exemplary drawing
 
1. A two-component aerosol can for dispensing sealing and assembly foams based on isocyanates, the can comprising:
an outer pressure container configured to hold a prepolymer component and a propellant gas, the outer pressure container being in communication with a first valve device and with a first channel disposed downstream of the first valve device in a flow direction of the prepolymer component;
an inner container configured to hold a curing component and a propellant gas, the inner container being in communication with a second valve device and with a second channel disposed downstream of the second valve device in a flow direction of the curing component;
a spray head comprising a device for simultaneously actuating the first and second valve devices; and
a spray tube disposed on the spray head and into which the first and second channels passing through the spray head jointly open in the flow directions, the spray tube configured to form a mixture by mixing the prepolymer component and the curing component dispensed from the spray head;
wherein the second valve device or the second channel comprises a throttle element configured to control a dispensing rate of the curing component and the prepolymer component, such that the dispensing rate for the curing component is lower than that of the prepolymer component and a quantitative ratio of the prepolymer component to the curing component in the spray tube is in a range 15:1 to 5:1,
the curing component is not sufficient to satisfy the isocyanate groups of the prepolymer component, such that in the mixture of the prepolymer component and the curing component dispensed there is an isocyanate excess of more than 3 wt %, based on the weight of the mixture,
the throttle is selected from the group consisting of a smaller cross section of the second channel, a narrowing in the second channel, a pin which partially closes an exit in the second valve, and a longer passage of the second channel in comparison to the first channel,
the propellant gas held in the outer pressure container is the same as the propellant gas held in the inner container,
a pressure of the propellant gas held in the outer pressure container is the same as a pressure of the propellant gas held in the inner container, and
a wall of the inner container is configured to allow an exchange of the propellant gases between the inner container and the outer pressure container.